Magnetism and Electromagnetism
The magnetic reluctance of a material

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

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Magnetism and Electromagnetism
The left hand rule correlates to

Current, magnetic field and direction of force on a conductor
Magnetic field, electric field and direction of force on a conductor
Current, induced e.m.f. and direction of force on a conductor
Self induction, mutual induction and direction of force on a conductor

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Magnetism and Electromagnetism
Main causes of noisy solenoid are

Both of the listed here
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

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Magnetism and Electromagnetism
The magnetomotive force is

The passage of magnetic field through an exciting coil
The flow of an electric current
The sum of all currents embraced by one line of magnetic field
The voltage across the two ends of exciting coil

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