Electromagnetic Field Theory
A copper disc is rotated rapidly below a freely suspended magnetic needle. The magnetic needle starts rotating with velocity

 less than that of disc and in the same direction.
 less than that of disc but in opposite direction.
 equal to that of disc and in the opposite direction.
 equal to that of disc and in the same direction.

ANSWER DOWNLOAD EXAMIANS APP

Electromagnetic Field Theory
Magnetostriction is a phenomenon of

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

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Electromagnetic Field Theory