Magnetism and Electromagnetism
In a simple magnetic field the strength of magnet flux

first increases and then decreases till it becomes zero
increases continuously from initial value to final value
is constant and has same value in energy part of the magnetic field
decreases continuously from initial value to final value

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Magnetism and Electromagnetism
Main causes of noisy solenoid are

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

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