Magnetism and Electromagnetism
Paramagnetic materials have relative permeability

equal to unity
equal to that ferromagnetic mate rials
slightly less than unity
slightly more than unity

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Magnetism and Electromagnetism
Main causes of noisy solenoid are

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

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