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A coil Q is connected to low voltage bul...

A coil Q is connected to low voltage bulb B and placed near another coil P as showns in Fig. Give reasons to explain the following observation : (a) The bulb B lights (b) Bulb gets dimmer if coil Q is moved toward left.

Text Solution

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(i) The bulb B light on account of emf induced in coil Q due to mutual induction between P and Q
(ii) When coil Q is moved towards left, magnetic flux linked with Q decreases, and may even reduce to zero at some distance. The emf induced may decrease and the bulb B gets dimmer.
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