Electromagnetic Field Theory
The wave in wave guide has

Group velocity inversely proportional to wavelength
Larger frequency than in the free space
Diminishing wavelength than in the free space
Larger wavelength than in the free space

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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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