Magnetism and Electromagnetism

A. loud-speakers
B. generators
C. motors
D. all of the above

A. Diamagnetic materials
B. Ferrimagnetic materials
C. Antiferromagnetic materials
D. Antiferrimagnetic materials

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

A. low coercivity
B. high susceptibility
C. both of the above
D. none of the above

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

A. heating
B. hammering
C. by inductive action of another magnet
D. by all above methods