electromagnetic induction MCQs – Page 5

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

electromagnetic induction Mcqs
81. A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by________________?
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A. variation in coil current

B. variation in voltage to the coil

C. change of number of turns of coil

D. the resistance of magnetic path

82. The co-efficient of coupling between two air core coils depends on____________?
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A. self-inductance of two coils only

B. mutual inductance and self inductance of two coils

C. mutual inductance between two coils only

D. none of the above

83. The inductance of a coil will increase under all the following conditions except______________?
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A. when permeability of the core increases

B. when more area for each turn is provided

C. when more length for the same number of turns is provided

D. when the number of turns of the coil increase

84. If the secondary coil has Ns turns and the primary Np turns the relation between secondary and primary voltages is given by_____________?
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A. Vp/Vs = Ns/Np

B. Vp/Vs = Np/Ns

C. Vs/Vp = Ns/Np

D. Vs/Vp = Np/Ns

85. Lenzs law is a consequence of the law of conservation of__________?
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A. charge

B. induced e.m.f.

C. induced current

D. energy
86. Long distance transmission is easy for________________?
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A. Half D.C voltage

B. A.C voltage

C. Half A.C voltage

D. D.C voltage