Electromagnetic Field Theory
Two infinite parallel metal plates are charged with equal surface charge density of the same polarity. The electric field in the gap between the plates is

 double the field produced by one plate.
 zero.
 dependent on coordinates of field points.
 same as that produced by one plate.

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Electromagnetic Field Theory
Magnetostriction is a phenomenon of

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

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