Magnetism and Electromagnetism
For which of the following materials the net magnetic moment should be zero?

antiferromagnetic materials
ferrimagnetic materials
diamagnetic materials
antiferrimagnetic materials

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Magnetism and Electromagnetism
Main causes of noisy solenoid are

Both of the listed here
None of these
strong tendency of fan out of laminations at the end caused by repulsion among magnetic lines of force
uneven bearing surface, caused by dirt or uneven wear between moving and stationary parts

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