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, the dielectric is strontium titanate 34. What is the capacitance of a metal sphere of radius? a. b. c. d. Performance Task 18.5 Capacitors and Dielectrics 35. Newton’s law of universal gravitation is where. This describes the gravitational force between two point masses m1 and m2. Coulomb’s law is 18.46 18.47 596 Cha... |
law for gravitational force was discovered much earlier than the law for electric force. (d) Consider a hydrogen atom, which is a single proton orbited by a single electron. The electric force holds the electron and proton together so that the hydrogen atom has a radius of about force between electron and proton does ... |
—The electric-field lines from a positive point charge spread out radially and point outward. a. b. false true 18.4 Electric Potential 48. What is the potential at 1.0 m from a point charge Q= − 25 nC? a. 6.6 × 102 V b. −2.3 × 102 V c. −6.6 × 102 V d. 2.3 × 102 V 49. Increasing the distance by a factor of two from a po... |
and the other connection of the lightbulb is connected to the negative terminal of the battery. The battery pushes charge through the circuit but does not become charged itself. Does this violate the law of conservation of charge? Explain. a. No, because this is a closed circuit. b. No, because this is an open circuit... |
. c. The cube is made of insulating material, because all the charges are on the surface of the cube. d. The cube is made of insulating material, because some of the charges are inside the cube. 61. You have four neutral conducting spheres and a charging device that allows you to place charge qon any neutral object. Yo... |
d. 18.3 Electric Field 66. The electric field a distance of 10 km from a storm cloud is 1,000 N/C. What is the approximate charge in the cloud? a. 0.0011 C 11 C b. 110 C c. 1,100 C d. Chapter 18 • Test Prep 599 d. +400 mC 72. Given the potential difference between two points and the distance between the points, explai... |
the plate separation? a. 20 µm b. 20 m c. 80 µm d. 80 m 75. Explain why a storm cloud before a lightning strike is like a giant capacitor. a. The storm cloud acts as a giant charged capacitor, 70. How is electric potential related to electric potential as it can store a large amount of charge. energy? a. Electric pote... |
Earth and physics in general. 78. True or false—Conservation of charge is like balancing a budget. a. b. true false 79. True or false—Although wood is an insulator, lightning can travel through a tree to reach Earth. a. b. true false touched to a second small metal sphere that is initially neutral. The spheres are the... |
82. A small metal sphere with a net charge of 3.0 nC is lines along it. d. Take the wire on the z-axis, and draw electric-field lines along it. 18.4 Electric Potential 85. A square grid has charges of Q= 10 nC are each corner. The sides of the square at 10 cm. How much energy does it require to bring a q= 1.0 nC charg... |
Electric energy in massive quantities is transmitted from this hydroelectric facility, the Srisailam power station located along the Krishna River in India, by the movement of charge—that is, by electric current. (credit: Chintohere, Wikimedia Commons) Chapter Outline 19.1 Ohm's law 19.2 Series Circuits 19.3 Parallel ... |
moves a large amount very quickly, whereas a small current, such as that used to operate a hand-held calculator, moves a small amount of charge more slowly. In equation form, electric current Iis defined as is the amount of charge that flows past a given area and where The SI unit for electric current is the ampere (A... |
. The electric field and the current are still to the right. Snap Lab Vegetable Current This lab helps students understand how current works. Given that particles confined in a pipe cannot occupy the same space, pushing more particles into one end of the pipe will force the same number of particles out of the opposite ... |
1 To keep the electrons moving thus requires a force, which is supplied by an electric field. The electric field in a wire points from the end of the wire at the higher potential to the end of the wire at the lower potential. Electrons, carrying a negative charge, move on average (or drift) in the direction opposite t... |
an alternating current. Many devices, however, use DC, such as computers, cell phones, flashlights, and cars. One source of DC is a battery, which provides a constant potential (DC potential) between its terminals. With your device connected to a battery, the DC potential pushes charge in one direction through the cir... |
10−3 A. b. The current passes through the circuit is 30 A. c. The current passes through the circuit is 33 A. d. The current passes through the circuit is 0.3 A. 2. How long would it take a current to charge a capacitor with? a. b. c. d. Resistance and Ohm’s Law As mentioned previously, electrical current in a wire is... |
Ohm’s law and shows a simple electrical circuit. The speaker uses the analogy of pressure to describe how electric potential makes charge move. He refers to electric potential as electric pressure. Another way of thinking about electric potential is to imagine that lots of particles of the same sign are crowded in a s... |
a Headlight What is the resistance of an automobile headlight through which 2.50 A flows when 12.0 V is applied to it? STRATEGY Ohm’s law tells us the battery, headlight.. The voltage drop in going through the headlight is just the voltage rise supplied by. We can use this equation and rearrange Ohm’s law to find the ... |
. Materials that do not follow Ohm’s law are called nonohmic. Practice Problems 3. If you double the voltage across an ohmic resistor, how does the current through the resistor change? a. The current will double. b. The current will increase by half. c. The current will decrease by half. d. The current will decrease by... |
devices. These devices contain ingenious electric circuits, which are complete, closed pathways through which electric current flows. Returning to our water analogy, an electric circuit is to electric charge like a network of pipes is to water: The electric circuit guides electric charge from one point to the next, ru... |
move along these pathways without losing any energy. In reality, the wires in circuits are not perfect, but they come close enough for our purposes. The zigzag element labeled Ris a resistor, which is a circuit element that provides a known resistance. Macroscopic resistors are often color coded to indicate their resi... |
.e., voltage). Coming back to the water circuit again, we see that the water returns to the bottom of the pump, which is like the charge returning to the negative terminal of the battery. The water pump uses a source of energy to pump the water back up to a high pressure again, giving it the pressure required to go thr... |
).. The voltage then drops as you go all the way to the negative Access for free at openstax.org. 19.2 • Series Circuits 615 Figure 19.11 The voltage in the red wire is constant at from the positive terminal of the battery to the top of the resistor. The voltage in the blue wire is constant at from the bottom of the re... |
the distance between them. c. The voltage between static charges is inversely proportional to the distance between them. d. The voltage between static charges is inversely proportional to square of the distance between them. Other possible circuit elements include capacitors and switches. These are drawn as shown on t... |
charges up, it does show the capacitor’s ability to store charge. Thus, the capacitor serves as a reservoir for charge. This property of capacitors is used in circuits in many ways. For example, capacitors are used to power circuits while batteries are being charged. In addition, capacitors can serve as filters. To un... |
that provide power to big cities to the nanoscale electronic circuits that are found in computers and cell phones (Figure 19.13). In working with power companies, you can be responsible for maintaining the power grid that supplies electrical power to large areas. Although much of this work is done from an office, it i... |
inating on the rail spike. The voltage difference immediately dropped to below 2.5 V and the missile was launched on schedule. Figure 19.13 The systems that electrical engineers work on range from microprocessor circuits (left)] to missile systems (right). Virtual Physics Click to view content (http://www.openstax.org/... |
On the left is an electric circuit with three resistors R1, R2, and R3 connected in series. On the right is an electric circuit with one resistor Requiv that is equivalent to the combination of the three resistors R1, R2, and R3. We will now try to find a single resistance that is equivalent to the three resistors in ... |
. 19.2 • Series Circuits 619 resistor. After going through resistor and set the sum equal to zero. This gives, we arrive back at the starting point, so we add up these four changes in voltage which is the same as the previous equation. Note that the minus signs in front of drops, whereas is a voltage rise. 19.10 are be... |
voltage rating of the battery. The voltage drop across each resistor is Adding these voltages together gives which is the voltage rating of the battery. WORKED EXAMPLE 19.17 19.18 Determine the Unknown Resistance The circuit shown in figure below contains three resistors of known value and a third element whose resist... |
respectively. Although the voltage drop across each resistor is the same, we cannot say the same for the current running through each resistor. Thus, are not necessarily the same, because the resistors do not necessarily have the same 622 Chapter 19 • Electrical Circuits resistance. Note that the three resistors in Fi... |
can apply the equation for the equivalent resistance of resistors in parallel, which takes the form 19.29 The circuit with the equivalent resistance is shown below. Once we know the equivalent resistance, we can use Ohm’s law to find the current in the circuit. Solution Inserting the given values for the resistance in... |
11. If a drop occurs across a. Voltage drop across is b. Voltage drop across is c. Voltage drop across is d. Voltage drop across is, and.... is connected in parallel to, what is the voltage drop across? Resistors in Parallel and in Series More complex connections of resistors are sometimes just combinations of series ... |
important for us to know the equivalent resistance of the entire circuit so that we can calculate the current flowing through the circuit. Ohm’s law tells us that the current flowing through a circuit depends on the resistance of the circuit and the voltage across the circuit. But to know the current, we must first kn... |
to detect balance, computing power to analyze the data and communicate the appropriate compensating actions, and joints and actuators to implement the required actions. In addition to sensing gravity or acceleration, robots can contain multiple different sensors to detect light, sound, temperature, smell, taste, etc. ... |
R)N. 628 Chapter 19 • Electrical Circuits b. The equivalent resistance is NR. c. The equivalent resistance is d. The equivalent resistance is WORKED EXAMPLE Find the Current through a Complex Resistor Circuit The battery in the circuit below has a voltage rating of 10 V. What current flows through the circuit and in wh... |
, the blue resistors constitute a path from the positive terminal of the battery to the negative terminal. In parallel with this circuit are the red resistors, which constitute another path from the positive to negative terminal of the battery. The blue and red paths are shown more cleanly drawn in the lower circuit di... |
d. The equivalent resistance is 1,925 Ω Check Your Understanding 14. The voltage drop across parallel resistors is ________. a. the same for all resistors b. greater for the larger resistors less for the larger resistors c. d. greater for the smaller resistors 15. Consider a circuit of parallel resistors. The smallest... |
633 Figure 19.20 On the left is a 25-W light bulb, and on the right is a 60-W light bulb. Why are their power outputs different despite their operating on the same voltage? The formula for power may be found by dimensional analysis. Consider the units of power. In the SI system, power is given in watts (W), which is e... |
ate electric power—on the contrary, capacitors either store electric energy or release electric energy back to the circuit. for electric power, we obtain two more expressions for power: one in To clarify how voltage, resistance, current, and power are all related, consider Figure 19.22, which shows the formula wheel. T... |
each insole should be 32 Discussion Let’s see how much current would run through this circuit. We have 18 V applied across a resistance of 32, so Ohm’s law gives 19.53 All batteries have labels that say how much charge they can deliver (in terms of a current multiplied by a time). A typical 9-V alkaline battery can de... |
the power dissipated in a resistor is b. The formula for the power dissipated in a resistor is c. The formula for the power dissipated in a resistor is d. The formula for the power dissipated in a resistor is Access for free at openstax.org. 19.4 • Electric Power 637 Check your Understanding 18. Which circuit elements... |
is constant over time; alternating current • The equivalent resistance of a group of Nidentical alternates smoothly back and forth over time. resistors Rconnected in parallel is R/N. • Electrical resistance causes materials to extract work • from the current that flows through them. In ohmic materials, voltage drop al... |
of the resistance. d. Current is inversely proportional to the square of the resistance. 3. In the context of electricity, what is resistance? a. Resistance is the property of materials to resist the passage of voltage. b. Resistance is the property of materials to resist the passage of electric current. c. Resistance... |
12V) and resistors (10Ω, 20Ω, 40Ω, and 50Ω) connected in series. c. Batteries (5V, 9V, and 12V) and resistors (10Ω, 20Ω, and 30Ω) connected in series. 14. What is the maximum resistance possible given a and a resistor of? resistor of a. b. c. d. 15. Rank the points A, B, C, and D in the circuit diagram from lowest vol... |
voltage, then the material is ohmic. d. Make a resistor from this material and measure the current going through this resistor for several different voltages. If the current is inversely proportional to the square of the voltage, then the Access for free at openstax.org. Chapter 19 • Chapter Review 641 a. The equivale... |
C, A, D c. C, B, A, D d. D, A, B, C 19.3 Parallel Circuits 16. Can all resistor combinations be reduced to series and parallel combinations? a. No, all practical resistor circuits cannot be reduced to series and parallel combinations. b. Yes, all practical resistor circuits can be reduced to series and parallel combin... |
equivalent resistance of the circuit shown below? a. The equivalent resistance is 25 Ω. b. The equivalent resistance is 50 Ω. c. The equivalent resistance is 75 Ω. d. The equivalent resistance is 100 Ω. 19.4 Electric Power 27. When 12 V are applied across a resistor, it dissipates 120 W of power. What is the current t... |
a. V/A b. C/m c. d. V/s 33. You put DC across resistor and measure the current through it. With the same voltage across resistor, you measure twice the current. What is the ratio 1? a. b. c. 4 d. 2 19.2 Series Circuits 34. What does the circuit element shown represent? 35. How many 10-Ω resistors must be connected in ... |
Ohm’s law says that the current through a resistor equals the voltage across the resistor multiplied by the resistance of the resistor. b. Ohm’s law says that the voltage across a resistor equals the current through the resistor multiplied by the resistance of the resistor. c. Ohm’s law says that the resistance of the... |
oving two 10-Ω resistors increases the total resistance of the circuit by about 40 percent. c. Adding four 10-Ω resistors increases the total resistance of the circuit by about 40 percent. d. Removing four 10-Ω resistors increases the total resistance of the circuit by about 40 percent. 55. Two identical resistors are ... |
voltage or reducing the resistance, with the current remaining constant. Which one would you choose? a. b. reduce the voltage to increase the power reduce the resistance to increase the power 59. What power is dissipated in the circuit consisting of 310-Ω resistors connected in series across a 9.0-V Extended Response ... |
one after the other, what resistors would be their total resistance? a. b. c. d. 19.2 Series Circuits 64. Explain why the current is the same at all points in the circuit below. a. b. c. If the current were not constant, the mobile charges would bunch up in places, which means that the voltage would decrease at that p... |
different voltage differences across each appliance. 19.4 Electric Power 67. A single resistor is connected across the terminals of a battery When you attach a second resistor in parallel with the first, does the power dissipated by the system change? a. No, the power dissipated remain same. b. Yes, the power dissipat... |
on a current- carrying wire in a magnetic field Section Key Terms Curie temperature domain electromagnet electromagnetism ferromagnetic magnetic dipole magnetic field magnetic pole magnetized north pole permanent magnet right-hand rule solenoid south pole Magnets and Magnetization People have been aware of magnets and... |
4 Depending on their relative orientation, magnet poles will either attract each other or repel each other. Consider again the fact that the pole of a magnet that orients northward is called the north pole of the magnet. If unlike poles attract, then the magnetic pole of Earth that is close to the geographic North Pole... |
an interesting introduction to magnetism and discusses, in particular, how electrons around their atoms contribute to the magnetic effects that we observe. Click to view content (https://www.openstax.org/l/28_intro_magn) GRASP CHECK Toward which magnetic pole of Earth is the north pole of a compass needle attracted? A... |
Regions within the material called domains act like small bar magnets. Within domains, the magnetic poles of individual atoms are aligned. Each atom acts like a tiny bar magnet. Domains are small and randomly oriented in an unmagnetized ferromagnetic object. In response to an external magnetic field, the domains may g... |
Magnetic Fields We have thus seen that forces can be applied between magnets and between magnets and ferromagnetic materials without any contact between the objects. This is reminiscent of electric forces, which also act over distances. Electric forces are described using the concept of the electric field, which is a ... |
can also flip the polarity of the magnet, or place Earth on the image to see how the compass orients itself. GRASP CHECK With the slider at the top right of the simulation window, set the magnetic field strength to 100 percent. Now use the magnetic field meter to answer the following question: Near the magnet, where i... |
two south poles are approached together. (b) If opposite poles are approached together, the magnetic field lines become denser between the poles and the magnets experience an attractive force. Like the electric field, the magnetic field is stronger where the lines are denser. Thus, between the two north poles in Figur... |
field is given by where Iis the current in the wire in amperes. The SI unit for magnetic field is the tesla (T). The symbol —read “mu-zero”—is a constant called the “permeability of free space” and is given by 20.2 20.1 Access for free at openstax.org. 20.1 • Magnetic Fields, Field Lines, and Force 657 Figure 20.13 Th... |
should be able to convince yourself that, inside the coil, the magnetic field points from left to right. In fact, another application of the right-hand rule is to curl your right-hand fingers around the coil in the direction in which the current flows. Your right thumb then points in the direction of the magnetic fiel... |
to two. d. The magnetic field strength increases to four times of its initial value when number of loops reduces from four to two. Magnetic Force If a moving electric charge, that is electric current, produces a magnetic field that can exert a force on another magnet, then the reverse should be true by Newton’s third ... |
drive is supposed to be silent because it has no moving parts. Instead, it uses the force experienced by charged particles that move in a magnetic field. The basic idea behind such a drive is depicted in Figure 20.18. Salt water flows through a channel that runs from the front to the back of the submarine. A magnetic ... |
through a magnetic field, consider now a steady current Imoving through a straight wire. If we place this wire in a uniform magnetic field, as shown in Figure 20.19, what is the force on the wire or, more precisely, on the electrons in the wire? An electric current involves charges that move. If the charges qmove a di... |
out of the page—the circles with dots represent vector arrow heads coming out of the page. STRATEGY Use the equation and the velocity vector of the proton is Solution The charge of the proton is the equation gives to find the magnitude of the force on the proton. The angle between the magnetic field vectors The direct... |
Wire with Current in Magnetic Field Now suppose we run a wire through the uniform magnetic field from the previous example, as shown. If the wire carries a current of 1.0 A in the -direction, and the region with magnetic field is 4.0 cm long, what is the force on the wire? Access for free at openstax.org. 20.1 • Magne... |
two magnets repel each other, what can you conclude about their relative orientation? a. Either the south pole of magnet 1 is closer to the north pole of magnet 2 or the north pole of magnet 1 is closer to the south pole of magnet 2. b. Either the south poles of both the magnet 1 and magnet 2 are closer to each other ... |
the wire loop, torque is exerted on it, making it turn the shaft. Let us examine the force on each segment of the loop in Figure 20.23 to find the torques produced about the axis of the vertical shaft—this will lead to a useful equation for the torque on the loop. We take the magnetic field to be uniform over the rect... |
the fact that the area of the loop is the expression for the torque becomes 666 Chapter 20 • Magnetism This is the torque on a current-carrying loop in a uniform magnetic field. This equation can be shown to be valid for a loop of any shape. 20.12 Figure 20.24 View from above of the wire loop from Figure 20.23. The ma... |
f, which drives a current through an external circuit. Because current is induced only in the side wires, we can find the induced emf by only considering these wires. As explained in Induced Current in a Wire, motional emf in a straight wire moving at velocity vthrough a magnetic field Bis where the velocity is perpend... |
a bit. In between, the emf goes through zero, which means that zero Figure 20.28 The emf of a generator is sent to a light bulb with the system of rings and brushes shown. The graph gives the emf of the generator as a function of time. is the peak emf. The period is where fis the frequency at which the coil is rotated ... |
uses. Figure 20.30 shows two different transformers. Notice the wire coils that are visible in each device. The purpose of these coils is explained below. Figure 20.30 On the left is a common laminated-core transformer, which is widely used in electric power transmission and electrical appliances. On the right is a to... |
called cores. The iron cores served as transformers, such as that shown in the previous figure. However, instead of looping the wires multiple times around the core, individual wires passed only a single time through the cores, making these single-turn transformers. Up to 63 wordwires could pass through a single core,... |
ers. The cross- is also related to changing flux by is the same on each side. The 20.20 20.21 Taking the ratio of these last two equations yields the useful relationship This is known as the transformer equation. It simply states that the ratio of the secondary voltage to the primary voltage in a transformer equals the... |
V. This is reduced to 120, 240, or 480 V for safety at the individual user site. Once the power has arrived at a population or industrial center, the voltage is stepped down at a substation to between 5 and 30 672 Chapter 20 • Magnetism kV. Finally, at individual homes or businesses, the power is stepped down again to ... |
91–1862) and American scientist Joseph Henry (1797–1878) independently demonstrated that magnetic fields can produce currents. The basic process of generating currents with magnetic fields is called induction; this process is also called magnetic induction to distinguish it from charging by induction, which uses the el... |
turn coil. For the same magnet speed, which coil produces a higher voltage? GRASP CHECK With the north pole to the left and moving the magnet from right to left, a positive voltage is produced as the magnet enters the coil. What sign voltage will be produced if the experiment is repeated with the south pole to the left... |
is proportional to the rate of changeof the magnetic field. Mathematically, we express this as 20.24 where is the change in the magnitude in the magnetic field during time and Ais the area of the loop. Figure 20.34 The bar magnet moves downward with respect to the wire loop, so that the number of magnetic field lines ... |
loop in a stable magnetic field induces an emf in the loop. Thus, the emf produced in a conducting loop is proportional to the rate of change of the productof the perpendicular magnetic field and the loop area 20.26 is the perpendicular magnetic field and Ais the area of the loop. The product where proportional to the... |
to Lenz’s law, the emf produced in the coil will drive a current in the direction that creates a pointing to the magnetic field inside the coil pointing to the left. This will counter the increase in magnetic flux pointing to the right. To see which way the current must flow, point your right thumb in the desired dire... |
a bar magnet that you can move through a coil. As you do so, you can see the electrons move in the coil and a light bulb will light up or a voltmeter will indicate the voltage across a resistor. Note that the voltmeter allows you to see the sign of the voltage as you move the magnet about. You can also leave the bar m... |
AMPLE EMF Induced in Conducing Coil by Moving Magnet Imagine a magnetic field goes through a coil in the direction indicated in Figure 20.37. The coil diameter is 2.0 cm. If the magnetic field goes from 0.020 to 0.010 T in 34 s, what is the direction and magnitude of the induced current? Assume the coil has a resistanc... |
a negative current must flow to the right, which again agrees with what we found by using Lenz’s law. WORKED EXAMPLE Magnetic Induction due to Changing Circuit Size The circuit shown in Figure 20.38 consists of a U-shaped wire with a resistor and with the ends connected by a sliding conducting rod. The magnetic field ... |
where we used the fact that the angle between the current and the magnetic field is the current into this equation gives Inserting our expression above for 20.37 20.38 The power contributed by the agent pulling the rod is 680 Chapter 20 • Magnetism The power dissipated by the circuit is 20.39 20.40 We thus see that ag... |
electrical energy into force on other magnets or magnetic material mechanical energy magnetized material that is induced to be magnetic or that electromagnet device that uses electric current to make a is made into a permanent magnet magnetic field north pole part of a magnet that orients itself toward the electromagn... |
to rotate in the magnetic field, which produces an AC voltage that drives an AC current through the loops. • Transformers contain a ring made of magnetic material and, on opposite sides of the ring, two windings of wire wrap around the ring. A changing current in one wire winding creates a changing magnetic field, whi... |
magnetic compass needle will experience the greatest torque at A. 3. In which direction do the magnetic field lines point near the south pole of a magnet? a. Outside the magnet the direction of magnetic field lines is towards the south pole of the magnet. b. Outside the magnet the direction of magnetic field lines is ... |
to place credit cards with magnetic strips near permanent magnets. a. b. false true 11. True or false—A square magnet can have sides that alternate between north and south poles. a. b. false true 12. You move a compass in a circular plane around a planar magnet. The compass makes four complete revolutions. How many po... |
b. A loop of wire should be placed farthest to the vacuum cleaner wire to maximize the magnetic flux through the loop. 684 Chapter 20 • Test Prep c. A loop of wire should be placed perpendicular to the vacuum cleaner wire to maximize the magnetic flux through the loop. d. A loop of wire should be placed at angle great... |
20.1 Magnetic Fields, Field Lines, and Force 22. For a magnet, a domain refers to ______. a. b. c. the region between the poles of the magnet the space around the magnet that is affected by the magnetic field the region within the magnet in which the Access for free at openstax.org. 10 Wb in 1.0 s? a. –100 A b. –2.0 A... |
. b. true false 20.2 Motors, Generators, and Transformers 27. An electrical generator ________. is a generator powered by electricity a. b. must be turned by hand c. converts other sources of power into electrical power d. uses magnetism to create electrons 28. A step-up transformer increases the a. voltage from power ... |
the needle by holding it perpendicular to a bar magnet’s north pole and pierce the cork along its longitudinal axis by the needle and place the needle-cork combination in the water. The needle now orients itself along the magnetic field lines of Earth. b. Magnetize the needle by holding it perpendicular to a bar magne... |
the direction of the field. d. Electric field lines form a loop and the electric force on a charge is in the perpendicular direction of field, while magnetic fields begin and end on opposite charge and the magnetic force on a charge is in the direction of the field. 37. To produce a magnetic field of 0.0020 T, what cu... |
long is at an angle of 45° with respect to a uniform magnetic field of 0.25 T. The wires have a resistance per unit length of 0.2. If the field drops to zero in 2.5 s, what magnitude current is induced in the square circuit? 35 µA a. b. 87.5 µA 3.5 mA c. 35 A d. 47. Yes or no—If a bar magnet moves through a wire loop ... |
field passing through the loop is zero. 43. How is the output emf of a generator affected if you b. No, because the net magnetic field passing through double the frequency of rotation of its coil? 688 Chapter 20 • Test Prep the loop is nonzero. c. Yes, because the net magnetic field passing through the loop is zero. d... |
are most dense; magnetic field lines points up the page. c. The magnetic field strength is greatest where the magnetic field lines are most dense; magnetic field lines points down the page. d. The magnetic field strength is greatest where the magnetic field lines are less dense; magnetic field lines points down the pa... |
force on the ring? Explain your reasoning. a. Magnets exert an attractive force, because magnetic field due to induced current is repulsed by the magnetic field of the magnets. b. Magnets exert an attractive force, because Chapter 20 • Test Prep 689 magnetic field due to induced current is attracted by the magnetic fi... |
future progress in solar energy and space exploration, the quantum nature of light should yield a rabbit hole of curious consequence, within which lie some of the most fascinating truths of our time. 692 Chapter 21 • The Quantum Nature of Light 21.1 Planck and Quantum Nature of Light Section Learning Objectives By the... |
encountering a new graph, it is best to try to interpret the graph before you read about it. Doing this will make the following text more meaningful and will help to remind yourself of some of the key concepts within the section. Access for free at openstax.org. 21.1 • Planck and Quantum Nature of Light 693 Understand... |
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