Magnetism and Electromagnetism
The magnetic reluctance of a material

Decreases with increasing cross sectional area of material
Any of the listed here
Increases with increasing cross-sec-tional area of material
Does not vary with increasing cross-sectional area of material

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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
Both of the listed here
None of these
uneven bearing surface, caused by dirt or uneven wear between moving and stationary parts

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