magnetism and electromagnetism MCQs – Page 5

Practise focused magnetism and electromagnetism questions with marked answers for exam preparation and subject revision.

magnetism and electromagnetism Mcqs
81. Main causes of noisy solenoid are______________?
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A. strong tendency of fan out of laminations at the end caused by repulsion among magnetic lines of force

B. uneven bearing surface, caused by dirt or uneven wear between moving and stationary parts

C. both of above

D. none of the above

82. When a magnet is in motion relative to a coil the induced e.m.f. does not depend upon____________?
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A. number of turns of the coil

B. motion of the magnet

C. resistance of the coil

D. pole strength of the magnet

83. Hysteresis loop in case of magnetically hard materials is more in shape as compared to magnetically soft materials
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A. triangular

B. circular

C. rectangular

D. none of the above

84. What will be the magnetic potential difference across the air gap of 2 cm length in magnetic field of 200 AT/m ?
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A. 6 AT

B. 4 AT

C. 2 AT

D. 10 AT

85. Paramagnetic materials have relative permeability________________?
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A. equal to unity

B. slightly more than unity

C. slightly less than unity

D. equal to that ferromagnetic mate rials

86. For which of the following materials the net magnetic moment should be zero ?
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A. Ferrimagnetic materials

B. Diamagnetic materials

C. Antiferromagnetic materials

D. Antiferrimagnetic materials