Electromagnetic Field Theory
Electric field intensity (E) at ant point in an electric field is equal to

 (potential gradient)1/3.
 (potential gradient)1/2.
 potential gradient.
 (potential gradient)2.

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Electromagnetic Field Theory
Magnetostriction is a phenomenon of

 generation of magnetism in electrical conductors.
 change in physical dimensions of ferromagnetic materials during magnetism.
 generation of electricity in ferromagnetic materials.
 change in permeability of ferromagnetic materials during magnetism.

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