Electromagnetic Induction Practice Test 2

1.

A rectangular loop is placed near a long straight wire carrying a current that is increasing with time. What is the direction of the induced current in the loop (viewed from above)?

a) Clockwise b) Counterclockwise c) No current d) Alternates direction

2.

A 0.2 m rod moves at 5 m/s perpendicular to a 0.4 T magnetic field. What is the induced emf?

a) 0.2 V b) 0.3 V c) 0.4 V d) 0.5 V

3.

Which of the following best describes the effect of decreasing the area of a coil in a changing magnetic field?

a) emf decreases b) emf increases c) emf stays the same d) emf becomes zero

4.

A coil of 100 turns and area 0.01 m² is perpendicular to a 0.2 T field. The field drops to zero in 0.5 s. What is the average induced emf?

a) 0.04 V b) 0.2 V c) 0.4 V d) 2.0 V

5.

Which of the following best describes the effect of increasing the frequency of the AC source in a transformer?

a) Increases the induced emf b) Decreases the induced emf c) No effect d) Reverses the current direction

6.

A 0.3 m rod moves at 2 m/s perpendicular to a 0.5 T field. What is the emf?

a) 0.15 V b) 0.3 V c) 0.5 V d) 1.0 V

7.

Which of the following best describes the induced emf in a coil when the magnetic field is constant but the area of the coil is changing?

a) emf is zero b) emf is constant c) emf depends on the rate of change of area d) emf depends on the resistance

8.

A coil of 50 turns, area 0.02 m², is perpendicular to a 0.1 T field. The field is reversed in 0.1 s. What is the average induced emf?

a) 0.2 V b) 0.4 V c) 2.0 V d) 4.0 V

9.

Which of the following best describes the energy loss in a real transformer?

a) All energy is transferred b) Energy is lost as heat c) Energy is lost as light d) No energy is lost

10.

A 0.4 m rod moves at 3 m/s perpendicular to a 0.25 T field. What is the emf?

a) 0.15 V b) 0.25 V c) 0.30 V d) 0.40 V

11.

Which of the following best describes the effect of increasing the resistance in an RL circuit on the time it takes for the current to reach its maximum value?

a) Increases the time b) Decreases the time c) No effect d) Time becomes infinite

12.

A coil of 20 turns and area 0.05 m² is perpendicular to a 0.3 T field. The field drops to zero in 0.2 s. What is the average induced emf?

a) 0.10 V b) 0.15 V c) 0.20 V d) 0.30 V

13.

Which of the following best describes the effect of increasing the number of turns in the secondary coil of a transformer?

a) Increases the output voltage b) Decreases the output voltage c) No effect d) Reverses the current direction

14.

A 0.25 m rod moves at 4 m/s perpendicular to a 0.2 T field. What is the emf?

a) 0.10 V b) 0.15 V c) 0.20 V d) 0.25 V

15.

Which of the following best describes the effect of increasing the inductance in an RL circuit on the rate at which current increases?

a) Increases the rate b) Decreases the rate c) No effect d) Reverses the current direction

16.

A coil of 10 turns and area 0.02 m² is perpendicular to a 0.5 T field. The field drops to zero in 0.1 s. What is the average induced emf?

a) 0.10 V b) 0.20 V c) 0.50 V d) 1.00 V

17.

Which of the following best describes the effect of increasing the number of turns in the primary coil of a transformer?

a) Increases the input voltage b) Decreases the input voltage c) No effect d) Reverses the current direction

18.

A 0.1 m rod moves at 10 m/s perpendicular to a 0.2 T field. What is the emf?

a) 0.1 V b) 0.2 V c) 0.4 V d) 0.5 V

19.

Which of the following best describes the effect of increasing the resistance in the secondary coil of a transformer?

a) Increases the current b) Decreases the current c) No effect d) Increases the voltage

20.

A coil of 40 turns and area 0.01 m² is perpendicular to a 0.25 T field. The field drops to zero in 0.2 s. What is the average induced emf?

a) 0.05 V b) 0.10 V c) 0.20 V d) 0.50 V

21.

A coil of 30 turns and area 0.04 m² is perpendicular to a 0.3 T field. The field drops to zero in 0.2 s. What is the average induced emf?

a) 0.06 V b) 0.12 V c) 0.18 V d) 0.24 V

22.

Which of the following best describes the effect of increasing the frequency of the AC source in an RL circuit?

a) Increases the inductive reactance b) Decreases the inductive reactance c) No effect d) Reverses the current direction

23.

A 0.5 m rod moves at 2 m/s perpendicular to a 0.2 T field. What is the emf?

a) 0.10 V b) 0.15 V c) 0.20 V d) 0.25 V

24.

A transformer has 500 turns on the primary and 100 turns on the secondary. If the input voltage is 120 V, what is the output voltage (ideal transformer)?

a) 24 V b) 60 V c) 120 V d) 600 V

25.

A coil of 15 turns and area 0.03 m² is perpendicular to a 0.2 T field. The field drops to zero in 0.1 s. What is the average induced emf?

a) 0.09 V b) 0.12 V c) 0.18 V d) 0.24 V

26.

Which of the following best describes the effect of increasing the area of a coil in a changing magnetic field?

a) Increases the induced emf b) Decreases the induced emf c) No effect d) Reverses the current direction

27.

A 0.2 m rod moves at 8 m/s perpendicular to a 0.25 T field. What is the emf?

a) 0.20 V b) 0.30 V c) 0.40 V d) 0.50 V

28.

Which of the following best describes the effect of increasing the area of the secondary coil in a transformer?

a) Increases the output voltage b) Decreases the output voltage c) No effect d) Reverses the current direction

29.

Which of the following best describes the energy loss in a real generator?

a) All energy is transferred b) Energy is lost as heat and friction c) Energy is lost as light d) No energy is lost

30.

A coil of 12 turns and area 0.05 m² is perpendicular to a 0.3 T field. The field drops to zero in 0.2 s. What is the average induced emf?

a) 0.09 V b) 0.12 V c) 0.18 V d) 0.24 V

Electromagnetic Induction Practice Test 2

30 New Challenging Questions – AP Physics C Level