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A circular coil expands radially in a re...

A circular coil expands radially in a region of magnetic field and no electromotive force is produced in the coil. this can be because

A

the magnetic field is constant

B

the magnetic field is in the same plane as the circular coil and it may or may not vary.

C

the magnetic field has a perpendicular (to the plane of the coil) component whose magnitude is decreasng suitably.

D

there is a constant magnetic field in the perpendicular (to plane of the coil) direction.

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