Electromagnetic Field Theory
The force on a charge moving with velocity v under the influence of electric and magnetic fields is given by which one of the following

 q(H + V × E).
 q(E + B × V).
 q(E + V × B).
 q(E +V × H).

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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.
 change in permeability of ferromagnetic materials during magnetism.
 generation of electricity in ferromagnetic materials.

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