Magnetism and Electromagnetism
Fleming's left hand rule is used to find

Direction of force on a current carrying conductor in a magnetic field
Polarity of a magnetic pole
Direction of magnetic field due to current carrying conductor
Direction of flux in a solenoid

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Magnetism and Electromagnetism
Main causes of noisy solenoid are

None of these
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
Both of the listed here

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