Question 1

Which of the following statements about superconductors is true?

Accepted Answer

A)  Both type I and type II superconductors have zero resistance below the critical temperature Tc. 
B)  In type I superconductors, the magnetic is expelled from the superconductors below the critical temperature Tc. 
C)  In type II superconductors, the magnetic is expelled from the superconductors below the critical temperature Tc and below a certain field Bc1. 
D)  Superconductors are prefect diamagnetics. 
E)  All the above statements are true. 
A)  Both type I and type II superconductors have zero resistance below the critical temperature Tc. 
B)  In type I superconductors, the magnetic is expelled from the superconductors below the critical temperature Tc. 
C)  In type II superconductors, the magnetic is expelled from the superconductors below the critical temperature Tc and below a certain field Bc1. 
D)  Superconductors are prefect diamagnetics. 
E)  All the above statements are true.

Question 2

For which of the following diagrams will current flow in the clockwise direction?

Accepted Answer

A)  1 and 2 
B)  3 and 4 
C)  1 and 3 
D)  2 and 4 
E)  2 and 3 
A)  1 and 2 
B)  3 and 4 
C)  1 and 3 
D)  2 and 4 
E)  2 and 3

Question 3

The motion of a conducting rod through a magnetic field creates a motional EMF E. If the rod accelerates to twice the speed, what will the motional EMF be?

Accepted Answer

A)  $\varepsilon$ 
B)  2$\varepsilon$ 
C)  $\varepsilon$/2 
D)  4$\varepsilon$ 
E)  $\varepsilon$2  
A)  $\varepsilon$ 
B)  2$\varepsilon$ 
C)  $\varepsilon$/2 
D)  4$\varepsilon$ 
E)  $\varepsilon$2

Question 4

A region of space contains a magnetic field of 500 G and an electric field of
3 *106 N/C. The magnetic energy density in a cubical box of side   = 20 cm in this region is

Accepted Answer

A)  550 J/m3  
B)  670 J/m3  
C)  864 J/m3  
D)  995 J/m3  
E)  None of these is correct. 
A)  550 J/m3  
B)  670 J/m3  
C)  864 J/m3  
D)  995 J/m3  
E)  None of these is correct.

Question 5

For which of the following diagram(s) will current flow through the light bulb?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  1 and 2 
A)  1 
B)  2 
C)  3 
D)  4 
E)  1 and 2

Question 6

A solenoid 50 cm long with a radius of 5.0 cm has 800 turns. You find that it carries a current of 10 A. The magnetic flux through it is approximately

Accepted Answer

A)  47 mWb 
B)  31 mWb 
C)  98 mWb 
D)  18 mWb 
E)  67 mWb 
A)  47 mWb 
B)  31 mWb 
C)  98 mWb 
D)  18 mWb 
E)  67 mWb

Question 7

An open switch in an RL circuit is closed at time t = 0, as shown. The curve that best illustrates the variation of potential difference across the inductor as a function of time is

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 8

A copper ring lies in the yz plane as shown. The magnet's long axis lies along the x axis. Induced current flows through the ring as indicated. The magnet

Accepted Answer

A)  must be moving away from the ring. 
B)  must be moving toward the ring. 
C)  must be moving either away from or toward the ring. 
D)  is not necessarily moving. 
E)  must remain stationary to keep the current flowing. 
A)  must be moving away from the ring. 
B)  must be moving toward the ring. 
C)  must be moving either away from or toward the ring. 
D)  is not necessarily moving. 
E)  must remain stationary to keep the current flowing.

Question 9

A circular wire coil of radius 25 cm and 20 turns is sitting in a perpendicular magnetic field of 0.2 T. If the coil is flipped over, what is the change in magnetic flux through the loop?

Accepted Answer

A)  0 Wb 
B)  1.6 Wb 
C)  0.080 Wb 
D)  0.80 Wb 
E)  0.040 Wb 
A)  0 Wb 
B)  1.6 Wb 
C)  0.080 Wb 
D)  0.80 Wb 
E)  0.040 Wb

Question 10

In this circuit,$\epsilon$0 = 12 V, R = 6.0 $\Omega$, and L = 0.48 H. The switch is closed at time t = 0. At time t = 0.25 s, the rate at which the battery is supplying power is approximately

Accepted Answer

A)  23 W 
B)  1.9 W 
C)  51 W 
D)  37 W 
E)  11 W 
A)  23 W 
B)  1.9 W 
C)  51 W 
D)  37 W 
E)  11 W

Question 11

How many turns are needed in a solenoid of radius 10 cm and length 20 cm for its self-inductance to be 6.0 H?

Accepted Answer

A)  30 
B)  74 
C)  500 
D)  550 
E)  5500 
A)  30 
B)  74 
C)  500 
D)  550 
E)  5500

Question 12

Use the following figure for the next two problems.  
-A rectangle is bent on two sides at 90 $\degree$ so that one end lies along the xy plane while the other end lies along the xz plane. The length a = 10 cm and b = 30 cm. A magnetic field of strength B = 0.1 T lies in the yz plane and points at an angle $\theta$ = 30 $\degree$ with the y axis. The flux through the rectangle is

Accepted Answer

A)  52.0 mWb 
B)  30.0 mWb 
C)  41.0 mWb 
D)  60.0 mWb 
E)  None of these is correct. 
A)  52.0 mWb 
B)  30.0 mWb 
C)  41.0 mWb 
D)  60.0 mWb 
E)  None of these is correct.

Question 13

A bar magnet is dropped through a loop of copper wire as shown. Recall that magnetic field lines point away from a north pole and toward a south pole. If the positive direction of the induced current I in the loop is as shown by the arrows on the loop, the variation of I with time as the bar magnet falls through the loop is illustrated qualitatively by which of the following graphs? The time when the midpoint of the magnet passes through the loop is indicated by C.

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 14

A region of space contains a magnetic field of 500 G and an electric field of
3 * 106 N/C. The electrical energy density in a cubical box of side   = 20 cm in this region is

Accepted Answer

A)  19.9 J/m3  
B)  39.8 J/m3  
C)  54.8 J/m3  
D)  66.9 J/m3  
E)  74.6 J/m3  
A)  19.9 J/m3  
B)  39.8 J/m3  
C)  54.8 J/m3  
D)  66.9 J/m3  
E)  74.6 J/m3

Question 15

The self-inductance of a wire coil is a proportionality constant that relates

Accepted Answer

A)  electric field to current. 
B)  electric flux to current. 
C)  magnetic flux to current. 
D)  magnetic field to current. 
E)  voltage to current. 
A)  electric field to current. 
B)  electric flux to current. 
C)  magnetic flux to current. 
D)  magnetic field to current. 
E)  voltage to current.

Question 16

A coil with self-inductance L carries a current I given by I = I0 sin 2 $\pi$ft
The graph that describes the self-induced EMF as a function of time is

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 17

The growth of current in the inductive circuit in the inset diagram is represented by the curve in the graph. The broken line is tangent to the curve at the origin. The time constant of the circuit is approximately

Accepted Answer

A)  3.0 ms 
B)  2/R ms 
C)  0.40 ms 
D)  4.0 ms 
E)  2.0 ms 
A)  3.0 ms 
B)  2/R ms 
C)  0.40 ms 
D)  4.0 ms 
E)  2.0 ms

Question 18

Use the following figure for the next two problems.  
-A rectangle is bent on two sides at 90$\degree$ so that one end lies along the xy-plane while the other end lies along the xz-plane. The length a = 10 cm and b = 30 cm. At t = 0, a magnetic field of strength B = 0.1 T lies in the yz-plane and points at an angle $\theta$ = 30$\degree$and 10 ms later the field points in the opposite direction. The EMF induced in the rectangle is

Accepted Answer

A)  10.4 V 
B)  6.0 V 
C)  12 V 
D)  8.2 V 
E)  None of these is correct. 
A)  10.4 V 
B)  6.0 V 
C)  12 V 
D)  8.2 V 
E)  None of these is correct.

Question 19

What is the average induced EMF between the ends of the wings of a plane flying at a speed of 500 km/hr when the vertical component of Earth's magnetic field is
3 * 10-5 T? The distance between the wingtips is 25 m.

Accepted Answer

A)  0.20 V 
B)  0.050 V 
C)  6.0 V 
D)  0.10 V 
E)  none of the above 
A)  0.20 V 
B)  0.050 V 
C)  6.0 V 
D)  0.10 V 
E)  none of the above

Question 20

Use the following figure for the next two problems:  
-A classic demonstration illustrating eddy currents is performed by dropping a permanent magnet inside a conducting cylinder. The magnet does not go into free fall. Instead it reaches terminal velocity and can take a few seconds to drop a length of about a meter. Suppose the mass of the magnet is 70 g and it has a terminal velocity of 10 cm/s. The length of the pipe is 80 cm. What is the magnitude of the magnetic force on the magnet when it is falling at the terminal velocity?

Accepted Answer

A)  0.35 N 
B)  0.79 N 
C)  0.97 N 
D)  0.69 N 
E)  None of these is correct. 
A)  0.35 N 
B)  0.79 N 
C)  0.97 N 
D)  0.69 N 
E)  None of these is correct.

Which of the following statements about superconductors is true?

For which of the following diagrams will current flow in the clockwise direction?

The motion of a conducting rod through a magnetic field creates a motional EMF E. If the rod accelerates to twice the speed, what will the motional EMF be?

A region of space contains a magnetic field of 500 G and an electric field of 3 *10⁶ N/C. The magnetic energy density in a cubical box of side = 20 cm in this region is

For which of the following diagram(s) will current flow through the light bulb?

A solenoid 50 cm long with a radius of 5.0 cm has 800 turns. You find that it carries a current of 10 A. The magnetic flux through it is approximately

An open switch in an RL circuit is closed at time t = 0, as shown. The curve that best illustrates the variation of potential difference across the inductor as a function of time is

A copper ring lies in the yz plane as shown. The magnet's long axis lies along the x axis. Induced current flows through the ring as indicated. The magnet

A circular wire coil of radius 25 cm and 20 turns is sitting in a perpendicular magnetic field of 0.2 T. If the coil is flipped over, what is the change in magnetic flux through the loop?

How many turns are needed in a solenoid of radius 10 cm and length 20 cm for its self-inductance to be 6.0 H?

A region of space contains a magnetic field of 500 G and an electric field of 3 * 10⁶ N/C. The electrical energy density in a cubical box of side = 20 cm in this region is

The self-inductance of a wire coil is a proportionality constant that relates

The growth of current in the inductive circuit in the inset diagram is represented by the curve in the graph. The broken line is tangent to the curve at the origin. The time constant of the circuit is approximately

What is the average induced EMF between the ends of the wings of a plane flying at a speed of 500 km/hr when the vertical component of Earth's magnetic field is 3 * 10^-5 T? The distance between the wingtips is 25 m.

The Electric Field I: Discrete Charge Distributions

The Electric Field II: Continuous Charge Distributions

Electric Potential

Capacitance

Electric Current and Direct-Current Circuits

The Magnetic Field

Sources of the Magnetic Field

Alternating-Current Circuits

Maxwells Equations and Electromagnetic Waves

Properties of Light

Optical Images

Interference and Diffraction

Wave Particle Duality and Quantum Physics

Applications of the Schrodinger Equation

Atoms

Molecules

Solids and the Theory of Conduction

Relativity

Nuclear Physics

Elementary Particles and the Beginning of the Universe

Filters

Exam 8: Magnetic Induction

Which of the following statements about superconductors is true?

For which of the following diagrams will current flow in the clockwise direction?

The motion of a conducting rod through a magnetic field creates a motional EMF E. If the rod accelerates to twice the speed, what will the motional EMF be?

A region of space contains a magnetic field of 500 G and an electric field of 3 *106 N/C. The magnetic energy density in a cubical box of side = 20 cm in this region is

For which of the following diagram(s) will current flow through the light bulb?

A solenoid 50 cm long with a radius of 5.0 cm has 800 turns. You find that it carries a current of 10 A. The magnetic flux through it is approximately

An open switch in an RL circuit is closed at time t = 0, as shown. The curve that best illustrates the variation of potential difference across the inductor as a function of time is

A copper ring lies in the yz plane as shown. The magnet's long axis lies along the x axis. Induced current flows through the ring as indicated. The magnet

A circular wire coil of radius 25 cm and 20 turns is sitting in a perpendicular magnetic field of 0.2 T. If the coil is flipped over, what is the change in magnetic flux through the loop?

In this circuit, ϵ\epsilonϵ 0 = 12 V, R = 6.0 Ω\OmegaΩ , and L = 0.48 H. The switch is closed at time t = 0. At time t = 0.25 s, the rate at which the battery is supplying power is approximately

How many turns are needed in a solenoid of radius 10 cm and length 20 cm for its self-inductance to be 6.0 H?

A region of space contains a magnetic field of 500 G and an electric field of 3 * 106 N/C. The electrical energy density in a cubical box of side = 20 cm in this region is

The self-inductance of a wire coil is a proportionality constant that relates

A coil with self-inductance L carries a current I given by I = I0 sin 2 π\piπ ft The graph that describes the self-induced EMF as a function of time is

The growth of current in the inductive circuit in the inset diagram is represented by the curve in the graph. The broken line is tangent to the curve at the origin. The time constant of the circuit is approximately

What is the average induced EMF between the ends of the wings of a plane flying at a speed of 500 km/hr when the vertical component of Earth's magnetic field is 3 * 10-5 T? The distance between the wingtips is 25 m.

The Electric Field I: Discrete Charge Distributions

The Electric Field II: Continuous Charge Distributions

Electric Potential

Capacitance

Electric Current and Direct-Current Circuits

The Magnetic Field

Sources of the Magnetic Field

Alternating-Current Circuits

Maxwells Equations and Electromagnetic Waves

Properties of Light

Optical Images

Interference and Diffraction

Wave Particle Duality and Quantum Physics

Applications of the Schrodinger Equation

Atoms

Molecules

Solids and the Theory of Conduction

Relativity

Nuclear Physics

Elementary Particles and the Beginning of the Universe

Filters

A region of space contains a magnetic field of 500 G and an electric field of 3 *10⁶ N/C. The magnetic energy density in a cubical box of side = 20 cm in this region is

A region of space contains a magnetic field of 500 G and an electric field of 3 * 10⁶ N/C. The electrical energy density in a cubical box of side = 20 cm in this region is

What is the average induced EMF between the ends of the wings of a plane flying at a speed of 500 km/hr when the vertical component of Earth's magnetic field is 3 * 10^-5 T? The distance between the wingtips is 25 m.