Electromagnetic Induction Mcqs | Set 6

MCQs 1: Find the force acting on a conductor 3m long carrying a current of 50 amperes at right angles to a magnetic field having a flux density of 0.67 tesla

100 N

400 N

600 N

1000 N

Answer Explanation

MCQs 2: An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is____________?

20 Wb

2 Wb

0.2 Wb

0.02 Wb

Answer Explanation

MCQs 3: Two 300 uH coils in series without mutual coupling have a total inductance of___________?

300 uH

600 uH

150 uH

75 uH

Answer Explanation

MCQs 4: Which of the fpllowing inductor will have the least eddy current losses ?

Air core

Laminated iron core

Iron core

Powdered iron core

Answer Explanation

MCQs 5: A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage ?

0.01 s

0.1 s

0.5 s

5 s

Answer Explanation

MCQs 6: A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is_____________?

50 ohms

500 ohms

1000 ohms

5000 ohms

Answer Explanation

MCQs 7: A conductor carries 125 amperes of current under 60° to a magnetic field of 1.1 tesla. The force on the conductor will be nearly______________?

50 N

120 N

240 N

480 N

Answer Explanation

MCQs 8: A conductor 2 meters long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be____________?

10 V

15 V

25V

50V

Answer Explanation

MCQs 9: Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be_____________?

6 H

8 H

12 H

24 H

Answer Explanation

MCQs 10: Lenz’s law is a consequence of the law of conservation of__________?

induced current

charge

energy

induced e.m.f.

Answer Explanation

MCQs 1: Find the force acting on a conductor 3m long carrying a current of 50 amperes at right angles to a magnetic field having a flux density of 0.67 tesla

MCQs 2: An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is____________?

MCQs 3: Two 300 uH coils in series without mutual coupling have a total inductance of___________?

MCQs 4: Which of the fpllowing inductor will have the least eddy current losses ?

MCQs 5: A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage ?

MCQs 6: A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is_____________?

MCQs 7: A conductor carries 125 amperes of current under 60° to a magnetic field of 1.1 tesla. The force on the conductor will be nearly______________?

MCQs 8: A conductor 2 meters long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be____________?

MCQs 9: Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be_____________?

MCQs 10: Lenz’s law is a consequence of the law of conservation of__________?

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