(1) If a magnetic field is changed round a coil then an induced current is set up in the coil. It can be done by taking a bar magnet and bringing it closer to the coil or taking it away from the coil.
(2) If a coil is moved in a magnetic field, then again an induced current is set up in the coil.
(3) If a coil is rotated in a uniform magnetic field, it may also cause an induced current in the coil.
(4) If we take two coils and insert them over a non conducting cylindrical roll then on changing current flowing in one coil, an induced current is obtained in the other coil.
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