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In Fig. a coil B is connected to a low v...

In Fig. a coil B is connected to a low voltage bulb L and placed parallel to another coil A, as shown. Explain the following observations : (i) bulb lights (ii) gets dimmer if the coil B is moved upwards.

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(i) Bulb lights because of emf induced in coil B due to mutual induction between A and B (ii) On moving coil B upwards, coeff, of mutual inductance (M) decreases. Induced emf (e) decreases. Bulb gets dimmer.
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