Electromagnetic Field Theory
A wire carrying current is bent in the form of a circular loop. Then the magnetic field around each portion of the wire will be

 parallel to half portion and perpendicular for the other half.
 perpendicular to the circumference of the wire.
 none of above.
 parallel to the plane of the wire.

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Electromagnetic Field Theory
Magnetostriction is a phenomenon of

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

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Electromagnetic Field Theory
The wave in wave guide has

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

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