Electromagnetic Field Theory
Inside a hollow conducting sphere

 electric field is a non zero constant.
 electric field changes with magnitude of the charge given to the conductor.
 electric field changes with distance from the center of the sphere.
 electric field is zero.

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Electromagnetic Field Theory
Magnetostriction is a phenomenon of

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

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