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.Management Sciences
Category: Electromagnetic Induction
Which of the following circuit element stores energy in the electromagnetic field ?
A. Inductance
B. Condenser
C. Variable resistor
D. Resistance
A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by________________?
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
Higher the self-inductance of a coil_____________?
A. lesser its weber-turns
B. lower the e.m.f. induced
C. greater the flux produced by it
D. longer the delay in establishing steady current through it
The emf induced in a coil by a changing magnetic flux may have unit as______________?
A. ms-1A
B. ms-2A-1
C. kgms2A-1
D. kgm2s-1A-1
In case of an inductance, current is proportional to___________?
A. voltage across the inductance
B. magnetic field
C. both A. and B.
D. neither (A) nor (B)
A.C cannot be used for________________?
A. producing heat
B. producing light
C. magnetizing and electroplating
D. all the above
Lagging of changes in the magnetization of a substance behind changes in the magnetic field as the magnetic field is varied is known as magnetic_____________?
A. Retaintivity
B. Permeability
C. Flux
D. Hysteresis
The co-efficient of coupling between two air core coils depends on____________?
A. self-inductance of two coils only
B. mutual inductance between two coils only
C. mutual inductance and self inductance of two coils
D. none of the above
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