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Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 14 (49 MCQs)

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1. What happens to the induced electromotive force (emf) if the speed of the movement of a conductor in a magnetic field is doubled?
2. A step-up transformer produces a 60 V a.c. output from a 12 V a.c. input. There are 50 turns on the secondary coil. How many turns are there on the primary coil?
3. A permanent horseshoe magnet is mounted so that the magnetic field lines are vertical. If a student passes a straight wire between the poles and pulls it toward herself, the current flow through the wire is from right to left. Which is the north pole of the magnet?
4. When the coil of a generator is rotated at a rate of 5 Hz, the maximum EMF generated is 2.5 V. If the coil is now rotated at 10 Hz, the maximum EMF generated is:
5. Phenomenon of generation of induced electromotive force and induced current a conductor as a result of the variation of the magnetic flux lines that intercepted by the conductor .
6. What does electromagnetism mean?
7. Mutual inductance between two coils depends on
8. How can the direction of an induced potential be reversed?
9. No EMF is induced when?
10. Which of the two and ammeter or voltmeter has a greater resistance
11. When the number of coils in a magnet is increased, what happens to the magnitude of the current?
12. What happens to the current in a coil while accelerating a magnet inside it?
13. What is the national grid?
14. The coil in a d.c. motor is connected to a split-ring commutator. What is the purpose of the split-ring commutator?
15. A solenoid of length 50 cm and 5000 turns carries a current of 10 A. What is the magnetic field at the ends of the solenoid?
16. Electric interactions occur between the charged particles that are mediated by their magnetic field.
17. Changing current in a coil produces e.m.f in another, this phenomenon is known as
18. A coil of area 30 $cm^2$
19. What did the experiment with the LED demonstrate?
20. When power is supplied to an electric motor, the motor armature rotates in a magnetic field and induced e.m.f. is generated. Which statement about the motor is not true?
21. What is the direction of induced current in a coil when the magnetic field through it changes?
22. The total number of magnetic field lines passing through an area is termed as?
23. True or false? A moving magnet can generate current in a wire.
24. The unit of self-inductance is
25. What does the index finger show you in the Fleming's right-hand rule?
26. Lenz's Law states that the induced current always flows in a direction that oppose the change of magnetic flux that causes it.
27. What is true of AC GENERATOR?
28. What type of current is produced by an AC generator?
29. A closed iron ring is held horizontally and a bar magnet is dropped through the ring with its length along the axis of the ring. The acceleration of the falling magnet is
30. Which particle is cathode ray?
31. All of the following statements are true about magnetic flux except
32. When the current in a coil is reduced uniformlyfrom 20 A to zero in 0.50 s, an e.m.f. of 4.0 V is induced in a neighbouring coil. What is the value of the mutual inductance between the two coils?
33. If the current in a coil changes at a rate of 2 A/s and the induced e.m.f. is 10 V, the self-inductance of the coil is
34. Lenz's law deals with:
35. Faraday's Law states that the induced emf is directly proportional to
36. An ideal transformer has 500 turns on the secondary and 50 turns on the primary, How much voltage is in the secondary if there is 10V in the primary?
37. What occurs when the live wire and the neutral wire come into direct contact in a circuit?
38. The magnetic field energy of a coil having 500 turns is 25 J. The current in the coil is 5 A. What magnetic flux penetrates each coil coil?
39. Interactions between charged particles.
40. The symbol and units of inductors are
41. Self induced emf is always proportional to the time rate of change of the current.
42. Assertion (A):Induced e.m.f. depends on number of turns and area of the coil. Reason (R):Induced e.m.f. increases with increase in number of turns of coil.
43. Explain the concept of self-induced electromotive force.
44. What would be the magnetic force of a pole located in the geographical south of the Earth?
45. What is the relationship between magnetic flux and induced EMF?
46. What effect does moving a magnet near a coil of wire have?
47. A straight wire, 2500 cm long, is mounted on an airplane flying at 125 m/s. The wire moves in a perpendicular direction through Earth's magnetic field (B = 5.0x10$^{-5}$ T). What EMF is induced in the wire?
48. Describe how a simple generator works using electromagnetic induction.
49. A device that increases or decreases the voltage of alternating current
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