Magnetism and Electromagnetism
When an iron piece is placed in a magnetic field

the magnetic lines of force will bend away from their usual paths in order to go away from the piece
the magnetic lines of force will bend away from their usual paths in order to pass through the piece
the iron piece will break
the magnetic field will not be affected

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Magnetism and Electromagnetism
Main causes of noisy solenoid are

Both of the listed here
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
None of these

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