Electromagnetic Field Theory
Magnetostriction is a phenomenon of

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

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Electromagnetic Field Theory
A long wire composed of a smooth round conductor runs above and parallel to the ground (assumed to be a large conducting plane). A high voltage exists between the conductor and the ground. The maximum electric stress occurs at

 the ground surface.
 lower surface of the conductor.
 upper surface of the conductor.
 midway between the conductor and ground.

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