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Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 14 (25 MCQs)

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1. What is the induced current produced by?
2. Square coil of side 16 cm having 200 turns rotating in magnetic field of 0.05 T with peak EMF of 12 V will produce angular velocity of
3. A moving conductor coil produces an induced e.m.f. This is in accordance with:
4. Can you produce current in a wire with a magnet that is sitting still?
5. What will be the direction of the induced current in a generator when the direction of the motion is upwards while the magnetic flux is to the right?
6. A magnet can move in a coil of wire to produce electricity in which system?
7. What is the relationship between the primary and secondary voltages in an ideal transformer?
8. What type of current is most commonly produced by power stations in India?
9. A moving coil galvanometer can be converted into voltmeter by connecting
10. What is the phenomenon called when electric current is generated by varying magnetic fields?
11. What happens to the induced voltage if the number of coils in a wire increases?
12. A transformer has 5500 turns on the primary coil and 500 turns on the secondary coil. The output of the secondary coil is 110 V a.c. and is connected to a heater. The transformer is 100% efficient. The heater produces a power of 132 W. What is the current in the primary coil?
13. What will be the acceleration of the falling bar magnet which passes through the ring such that the ring is held horizontally and the bar magnet is dropped along the axis of the ring?
14. In the context of electromagnetic induction, what does "emf" stand for?
15. A coil is rotated in a magnetic field. What is the effect on the induced EMF if the speed of rotation is doubled?
16. Faraday's Law states that the induced emf is proportional to Hide answers
17. Which object(s) have electric fields?
18. A rectangular loop of area 5 metre square has 50 turns and carries a current of 1A. it is held in a uniform magnetic field of 0.1 Tesla at an angle of 30 degree.calculate the torque experienced by the coil
19. You have two magnets. One is in your hand and the other is sitting on a table. You move the SOUTH pole of your magnet near the SOUTH pole of the magnet on the table. What happens?
20. If you break a bar magnet in half, you can separate the north and south pole of the original magnet.
21. Which of the following best describes a magnetic flux?
22. Name the phenomenon in which an EMF is induced in a coil due to the change of current in the same coil
23. How do you make an electromagnet stronger?
24. What is the phase relationship between the primary and secondary currents in an ideal transformer?
25. State which material is suitable to be the core of a transformer!
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