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An e.m.f. is produced in a coil, which i...

An e.m.f. is produced in a coil, which is not connected to an external voltage source. This can be due to

A

the coil being in a time varying magnetic field.

B

the coil moving in a time varying magnetic field

C

the coil moving in a constant magnetic field.

D

the coil is stationary in external sptatially varying magnetic field, which does not change with time.

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