Question 1

A circular coil of wire sits in a magnetic field of strength 0.5 mT. The wire has 300 turns, and has a radius of 0.04 m. If it is spinning at a rate of 55 rad/s, what is the angular frequency of the current generated?

Accepted Answer

A)   0.041 rad/s
B)   0.33 rad/s
C)   55 rad/s
D)   It generates a constant, steady current.
E)   None of the above.F) D) and E)
G) C) and D)

Question 2

Suppose you double the magnetic field in a given region and quadruple the area through which this magnetic field exists. The effect on the flux through this area would be to

Accepted Answer

A)   leave it unchanged.
B)   double it.
C)   quadruple it.
D)   increase it by a factor of 6.
E)   increase it by a factor of 8.F) D) and E)
G) A) and D)

Question 3

A uniform magnetic field of 0.5 T is parallel to the z-axis. A square coil of side 10 cm has 300 turns and lies in the xy plane as shown. The magnetic flux through the coil is

Accepted Answer

A)   0.14 Wb.
B)   0.75 Wb.
C)   1.5 Wb.
D)   0.27 Wb.
E)   zero.F) B) and D)
G) All of the above

Question 4

Which of the following is a vector quantity?

Accepted Answer

A)   current
B)   charge
C)   magnetic field
D)   electric potential
E)   magnetic fluxF) A) and E)
G) A) and D)

Question 5

A conducting loop around a bar magnet begins to move away from the magnet. Which of the following statements is true?

Accepted Answer

A)   The magnet and the loop repel one another.
B)   The magnet and the loop attract one another.
C)   The magnet is attracted, but the loop is repelled.
D)   The magnet is repelled, but the loop is attracted.
E)   The magnet and loop neither attract nor repel one another.F) A) and E)
G) A) and D)

Question 6

A circular wire coil of radius 25 cm and 20 turns is sitting in a perpendicular magnetic field of 0.20 T. If the coil is rotated 90o, what is the magnitude of 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 WbF) B) and D)
G) A) and D)

Question 7

2 V, then calculate the number of revolutions per second of the rod.

Accepted Answer

A)   6.7 × 101 revs/s
B)   6.7 × 103 revs/s
C)   4.7 × 10-3 revs/s
D)   6.7 × 102 revs/s
E)   2.1 × 102 revs/sF) A) and E)
G) A) and B)

Question 8

You place a single loop of wire 0.50 m by 0.30 m perpendicular to a field of 2.0 T. In 30 ms you turn the loop until it is parallel with the field. The average EMF induced in this loop is

Accepted Answer

A)   0.30 V.
B)   10 V.
C)   5.0 V.
D)   67 V.
E)   20 V.F) A) and B)
G) A) and C)

Question 9

A metal disk rotates about its central axis at an angular frequency of 800 radians per second in a uniform magnetic field of 0.8 T. The diameter of the disk is 8 cm. What is the magnitude of the voltage difference between the center and edge of the disk?

Accepted Answer

A)   0 V
B)   0.80 V
C)   0.51 V
D)   1.0 V
E)   3.1 VF) A) and E)
G) None of the above

Question 10

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

Accepted Answer

A)   ε
B)   2ε
C)   ε/2
D)   4ε
E)   ε2F) A) and D)
G) B) and E)

Exam 20: Electromagnetic Induction

2 V, then calculate the number of revolutions per second of the rod.

Correct Answer
verified

A uniform magnetic field of 0.5 T is parallel to the z-axis. A square coil of side 10 cm has 300 turns and lies in the xy plane as shown. The magnetic flux through the coil is

Correct Answer
verified

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

Correct Answer
verified

A conducting loop around a bar magnet begins to move away from the magnet. Which of the following statements is true?

Correct Answer
verified

A circular coil of wire sits in a magnetic field of strength 0.5 mT. The wire has 300 turns, and has a radius of 0.04 m. If it is spinning at a rate of 55 rad/s, what is the angular frequency of the current generated?

Correct Answer
verified

Which of the following is a vector quantity?

Correct Answer
verified

A circular wire coil of radius 25 cm and 20 turns is sitting in a perpendicular magnetic field of 0.20 T. If the coil is rotated 90^o, what is the magnitude of the change in magnetic flux through the loop?

Correct Answer
verified

Suppose you double the magnetic field in a given region and quadruple the area through which this magnetic field exists. The effect on the flux through this area would be to

Correct Answer
verified

You place a single loop of wire 0.50 m by 0.30 m perpendicular to a field of 2.0 T. In 30 ms you turn the loop until it is parallel with the field. The average EMF induced in this loop is

Correct Answer
verified

A metal disk rotates about its central axis at an angular frequency of 800 radians per second in a uniform magnetic field of 0.8 T. The diameter of the disk is 8 cm. What is the magnitude of the voltage difference between the center and edge of the disk?

Correct Answer
verified

Exam 20: Electromagnetic Induction

2 V, then calculate the number of revolutions per second of the rod.

Correct AnswerverifiedShow Answer

A uniform magnetic field of 0.5 T is parallel to the z-axis. A square coil of side 10 cm has 300 turns and lies in the xy plane as shown. The magnetic flux through the coil is

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A conducting loop around a bar magnet begins to move away from the magnet. Which of the following statements is true?

Correct AnswerverifiedShow Answer

A circular coil of wire sits in a magnetic field of strength 0.5 mT. The wire has 300 turns, and has a radius of 0.04 m. If it is spinning at a rate of 55 rad/s, what is the angular frequency of the current generated?

Correct AnswerverifiedShow Answer

Which of the following is a vector quantity?

Correct AnswerverifiedShow Answer

A circular wire coil of radius 25 cm and 20 turns is sitting in a perpendicular magnetic field of 0.20 T. If the coil is rotated 90o, what is the magnitude of the change in magnetic flux through the loop?

Correct AnswerverifiedShow Answer

Suppose you double the magnetic field in a given region and quadruple the area through which this magnetic field exists. The effect on the flux through this area would be to

Correct AnswerverifiedShow Answer

You place a single loop of wire 0.50 m by 0.30 m perpendicular to a field of 2.0 T. In 30 ms you turn the loop until it is parallel with the field. The average EMF induced in this loop is

Correct AnswerverifiedShow Answer

A metal disk rotates about its central axis at an angular frequency of 800 radians per second in a uniform magnetic field of 0.8 T. The diameter of the disk is 8 cm. What is the magnitude of the voltage difference between the center and edge of the disk?

Correct AnswerverifiedShow Answer

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A circular wire coil of radius 25 cm and 20 turns is sitting in a perpendicular magnetic field of 0.20 T. If the coil is rotated 90^o, what is the magnitude of the change in magnetic flux through the loop?

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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