Electromagnetic Field Theory
Radiation intensity in a given direction is the

Energy radiated per square metre
Power radiated per square metre
Power radiated per unit solid angle in that direction
None of these

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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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