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The principal reason voltage is induced in the loops of a generator coil is that the

Aloops are rotating, changing the amount of magnetic field within the loops.
Bsize of the loops is changing.
Cmagnet's strength is changing.
Dmagnet is rotating. E. all of the above

Verified Answer :

Hagrid

The principal reason voltage is
induced in the loops of a generator coil is that the loops are rotating,
changing the amount of magnetic field within the loops. The answer is letter A.
For example, in a circuit, the electrons in
the bulb will not move without the potential difference or voltage. When there
is voltage, electric current occurs because there is a driving force for the
electrons in the wire to move.