A. loud-speakers
B. generators
C. motors
D. all of the above
0
For which of the following materials the net magnetic moment should be zero ?
0
Which of the following statements is correct ?
A. Diamagnetic materials
B. Ferrimagnetic materials
C. Antiferromagnetic materials
D. Antiferrimagnetic materials
0
Core of an electromagnet should have____________?
A. The conductivity of ferrites is better than ferromagnetic materials
B. The conductivity of ferromagnetic materials is better than ferrites
C. The conductivity of ferrites is very high
D. The conductivity of ferrites is same as that of ferromagnetic materials
0
Main causes of noisy solenoid are______________?
A. low coercivity
B. high susceptibility
C. both of the above
D. none of the above
0
Magnetism of a magnet can be destroyed by_____________?
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
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