Question 1

Two coils, 1 and 2, with iron cores are positioned as shown in the figure.Coil 1 is part of a circuit with a battery and a switch. 
-Assume S has been closed for a long time.Which one of the following statements is true when coil 1 and its core are moved toward point B?

Accepted Answer

A)  There is no induced current in r.
B)  There is a magnetic field in coil 1 that points toward B.
C)  There is an induced current in R that flows from left to right.
D)  There is an induced current in R that flows from right to left.
E)  There is an induced magnetic field in coil 2 that points toward B.F) B) and D)
G) None of the above

Question 2

22-3
A single conducting loop with an area of 2.0 m2 rotates in a uniform magnetic field so that the induced emf has a sinusoidal time dependence as shown. 2 rotates in a uniform magnetic field so that the induced emf has a sinusoidal time dependence as shown.   -The current in a solenoid is decreased to one-half of its original value.Which one of the following statements is true concerning the self-inductance of the solenoid? A) The self-inductance does not change. B) The self-inductance increases by a factor of two. C) The self-inductance decreases by a factor of two. D) The self-inductance increases by a factor of four. E) The self-inductance decreases by a factor of four." class="answers-bank-image d-inline" rel="preload" >
-The current in a solenoid is decreased to one-half of its original value.Which one of the following statements is true concerning the self-inductance of the solenoid?

Accepted Answer

A)  The self-inductance does not change.
B)  The self-inductance increases by a factor of two.
C)  The self-inductance decreases by a factor of two.
D)  The self-inductance increases by a factor of four.
E)  The self-inductance decreases by a factor of four.F) D) and E)
G) C) and E)

Question 3

A flexible, circular conducting loop of radius 0.15 m and resistance 4.0   Ω\OmegaΩ  lies in a uniform magnetic field of 0.25 T.The loop is pulled on opposite sides by equal forces and stretched until its enclosed area is essentially zero m2, as suggested in the drawings.It takes 0.30 s to close the loop. 2, as suggested in the drawings.It takes 0.30 s to close the loop.   -At what rate is heat generated in the loop? A) 3.6 × 10-3 W B) 8.7 × 10-4 W C) 8.7 × 104 W D) 8.1 × 105 W E) 8.1 × 10-5 W " class="answers-bank-image d-inline" rel="preload" >
-At what rate is heat generated in the loop?

Accepted Answer

A)  3.6 × 10-3 W
B)  8.7 × 10-4 W
C)  8.7 × 104 W
D)  8.1 × 105 W
E)  8.1 × 10-5 W F) D) and E)
G) None of the above

Question 4

A small power plant produces a voltage of 6.0 kV and 150 A.The voltage is stepped up to 240 kV by a transformer before it is transmitted to a substation.The resistance of the transmission line between the power plant and the substation is 75   Ω\OmegaΩ .
-What is the current in the transmission line from the plant to the substation?

Accepted Answer

A)  3.8 A
B)  5.2 A
C)  6.4 A
D)  7.0 A
E)  7.5 A F) A) and B)
G) C) and D)

Question 5

A circuit is pulled with a 21-N force toward the right to maintain a constant speed v.At the instant shown, the loop is partially in and partially out of a uniform magnetic field that is directed into the paper.As the circuit moves, a 4.0-A current flows through a 6.0-  Ω\OmegaΩ resistor. 
-What is the magnitude of v?

Accepted Answer

A)  1.5 m/s
B)  4.6 m/s
C)  6.4 m/s
D)  7.8 m/s
E)  9.0 m/s F) A) and D)
G) D) and E)

Question 6

A conducting loop has an area of 0.065 m2 and is positioned such that a uniform magnetic field is perpendicular to the plane of the loop.When the magnitude of the magnetic field decreases to 0.30 T in 0.087 s, the average induced emf in the loop is 1.2 V.What is the initial value of the magnetic field?

Accepted Answer

A)  0.42 T
B)  0.75 T
C)  0.87 T
D)  1.2 T
E)  1.9 TF) A) and B)
G) All of the above

Question 7

A circuit is pulled with a 21-N force toward the right to maintain a constant speed v.At the instant shown, the loop is partially in and partially out of a uniform magnetic field that is directed into the paper.As the circuit moves, a 4.0-A current flows through a 6.0-  Ω\OmegaΩ resistor. 
-Which one of the following statements concerning this situation is true?

Accepted Answer

A)  The temperature of the circuit remains constant.
B)  The induced current flows clockwise around the circuit.
C)  Since the circuit moves with constant speed, the force F does zero work.
D)  If the circuit were replaced with a wooden loop, there would be no induced emf.
E)  As the circuit moves through the field, the field does work to produce the current. F) A) and E)
G) All of the above

Question 8

Two coils share a common axis as shown in the figure.The mutual inductance of this pair of coils is 6.0 mH.If the current in coil 1 is changing at the rate of 3.5 A/s, what is the magnitude of the emf generated in coil 2? -4 V B) 1.7 × 10-3 V C) 3.5 × 10-3 V D) 1.5 × 10-2 V E) 2.1 × 10-2 V" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  5.8 × 10-4 V
B)  1.7 × 10-3 V
C)  3.5 × 10-3 V
D)  1.5 × 10-2 V
E)  2.1 × 10-2 VF) A) and B)
G) B) and C)

Question 9

A 1.2-kg rod that has a length of 1.0 m and a resistance of 5.0   Ω\OmegaΩ  slides with constant speed down a pair of frictionless vertical conducting rails that are joined at the bottom.Other than the rod, the rest of the circuit is resistanceless.A uniform magnetic field of magnitude 3.0 T is perpendicular to the plane formed by the rod and the rails as shown.Determine the speed of the rod.

Accepted Answer

A)  0.38 m/s
B)  0.90 m/s
C)  2.6 m/s
D)  6.5 m/s
E)  8.7 m/s F) D) and E)
G) B) and C)

Question 10

22-4
A 0.100-m long solenoid has a radius of 0.050 m and 1.50 × 104 turns.The current in the solenoid changes at a rate of 6.0 A/s.A conducting loop of radius 0.0200 m is placed at the center of the solenoid with its axis the same as that of the solenoid as shown. 4 turns.The current in the solenoid changes at a rate of 6.0 A/s.A conducting loop of radius 0.0200 m is placed at the center of the solenoid with its axis the same as that of the solenoid as shown.   -Determine the induced emf in the loop. A) 0.7 × 10-3 V B) 1.4 × 10-3 V C) 2.8 × 10-3 V D) 5.6 × 10-3 V E) zero volts" class="answers-bank-image d-inline" rel="preload" >
-Determine the induced emf in the loop.

Accepted Answer

A)  0.7 × 10-3 V
B)  1.4 × 10-3 V
C)  2.8 × 10-3 V
D)  5.6 × 10-3 V
E)  zero voltsF) A) and B)
G) A) and C)

Question 11

A 0.60-T magnetic field is directed perpendicular to the plane of a circular loop of radius 0.40 m.What is the magnitude of the magnetic flux through the loop?

Accepted Answer

A)  0.049 Wb
B)  0.098 Wb
C)  0.24 Wb
D)  0.30 Wb
E)  zero WbF) A) and E)
G) A) and D)

Exam 22: Electromagnetic Induction

Correct Answer
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Two coils, 1 and 2, with iron cores are positioned as shown in the figure.Coil 1 is part of a circuit with a battery and a switch. -Assume S has been closed for a long time.Which one of the following statements is true when coil 1 and its core are moved toward point B?

Correct Answer
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A 0.60-T magnetic field is directed perpendicular to the plane of a circular loop of radius 0.40 m.What is the magnitude of the magnetic flux through the loop?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Two coils share a common axis as shown in the figure.The mutual inductance of this pair of coils is 6.0 mH.If the current in coil 1 is changing at the rate of 3.5 A/s, what is the magnitude of the emf generated in coil 2?

Correct Answer
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Correct Answer
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Correct Answer
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Exam 22: Electromagnetic Induction

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Two coils, 1 and 2, with iron cores are positioned as shown in the figure.Coil 1 is part of a circuit with a battery and a switch. -Assume S has been closed for a long time.Which one of the following statements is true when coil 1 and its core are moved toward point B?

Correct AnswerverifiedShow Answer

A 0.60-T magnetic field is directed perpendicular to the plane of a circular loop of radius 0.40 m.What is the magnitude of the magnetic flux through the loop?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Two coils share a common axis as shown in the figure.The mutual inductance of this pair of coils is 6.0 mH.If the current in coil 1 is changing at the rate of 3.5 A/s, what is the magnitude of the emf generated in coil 2?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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