Electromagnetic Field Theory
The magnetic field at any point on the axis of current carrying circular coil will be

 perpendicular to axis.
 at an angle 45o with the axis.
 parallel to axis.
 zero.

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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 electricity in ferromagnetic materials.
 generation of magnetism in electrical conductors.

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