Magnetism and Electromagnetism
Out of the following statements, concerning an electric field, which statement is not true?

An electric field is defined as a point in space at which an electric charge would experience a force
The electric intensity is a vector quantity
The electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point
Unit field intensity in the exertion of a force of one newton on a charge of one coulomb

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Magnetism and Electromagnetism
Main causes of noisy solenoid are

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
None of these
Both of the listed here

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