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Magnetism and Electromagnetism - Interview Questions and Answers

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31. A 200 turn coil having an axial length of 30 mm and a radius of 10 mm is pivoted in a magnetic field having a flux density of 0.8 T. If the coil carries a current of 0.5 A, the torque acting on the coil will be
A. 8 N-m
B. 0.48 N-m
C. 0.048 N-m
D. 0.0048 N-m
Explanation:
32. When two ends of a circular uniform wire are joined to the terminals of a battery, the field at the centre of the circle
A. will be zero
B. will be infinite
C. will depend on the amount of e.m.f. applied
D. will depend on the radius of the circle
Explanation:
33. When a magnet is in motion relative to a coil the induced e.m.f. does not depend upon
A. resistance of the coil
B. motion of the magnet
C. number of turns of the coil
D. pole strength of the magnet
Explanation:
34. In the left hand rule, forefinger always represents
A. voltage
B. current
C. magnetic field
D. direction of force on the conductor
Explanation:
35. Reciprocal of permeability is
A. reluctivity
B. susceptibility
C. permittivity
D. conductance
Explanation:
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