electromagnetic induction MCQs – Page 3

Practise focused electromagnetic induction questions with marked answers for exam preparation and subject revision.

electromagnetic induction Mcqs

41. An open coil has_____________?
0

A. zero resistance and high inductance

B. infinite resistance and zero inductance

C. infinite resistance and normal inductance

D. zero resistance and inductance

42. An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be______________?
0

A. 32 A/s

B. 16 A/s

C. 64 A/s

D. 4 A/s

43. In case all the flux from the current in coil 1 links with coil 2, the co-efficient of coupling will be____________?
0

A. zero

B. 1.0

C. 2

D. 0.5

44. The law that the induced e.m.f. and current always oppose the cause producing them is due to____________?
0

A. Coulomb

B. Lenz

C. Newton

D. Faraday

45. emf induced in a circuit according to Faradays law depends on the_____________?
0

A. maximum magnetic flux

B. initial magnetic flux

C. rate of change of magnetic flux

D. change in magnetic flux

46. Energy stored in a magnetic field is given by______________?
0

A. LI2/2

B. LI2

C. IL2

D. L2I/2

47. A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area, length etc.) remaining the same, the inductance will be___________?
0

A. 6 mH

B. 24 mH

C. 48 mH

D. 14 mH

48. Mutually inductance between two magnetically-coupled coils depends on____________?
0

A. cross-sectional area of their common core

B. permeability of the core

C. the number of their turns

D. all of the above

49. Which one of the following functions like a motor ?
0

A. galvanometer

B. all of above

C. ammeter

D. voltmeter

50. 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_____________?
0

A. 8 H

B. 6 H

C. 12 H

D. 24 H

51. 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____________?
0

A. 2 Wb

B. 0.2 Wb

C. 20 Wb

D. 0.02 Wb

52. Which of the following works on torque on the current carrying conductor placed in magnetic field ?
0

A. ammeter

B. galvanometer

C. voltmeter

D. all of the above

53. Reversing the field or the current will reverse the force on the conductor
0

A. Yes

B. No

54. The polarity of the induced voltage can be determined by using the left-hand generator rule
0

A. Yes

B. No

55. For long distance transmission the transformer used is_____________?
0

A. Input voltage and output voltage remain same

B. Step down

C. Step up

D. Amplifier is used

56. As per Faradays laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it_______________?
0

A. lies in a magnetic field

B. lies perpendicular to the magnetic flux

C. cuts magnetic flux

D. moves parallel to the direction of the magnetic field

57. A.C can not be used for_______________?
0

A. producing light

B. Producing magnetic field

C. Magnetizing iron

D. producing heat

58. 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____________?
0

A. 25V

B. 15 V

C. 50V

D. 10 V

59. Which of the following uses electric energy and does not convert it into any other form ?
0

A. motor

B. transformer

C. D.C generator

D. A.C generator

60. Two coils have inductances of 8 mH and 18 mH and a co-efficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be______________?
0

A. 38 mH

B. 40 mH

C. 48 mH

D. 32 mH

Previous Next

Showing 41 to 60 of 86 mcqs