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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 shown in the fiugre. Give reasons to explain the following observations :
(a) The bulb 'B' lights.
(ii) Bulb gets dimmer if the coil Q is moved towards left.

Text Solution

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(a)The `A.C.` source creates a varying magnetic field in coil `P`.This varying magnetic field of `P` is linked to coil `Q`.Hence, an induced current is produced in `Q`, which lights bulb `B`.
(b)As coil `Q` moves away from `P`, the rate of varition of magnetic flux changes.Therefore, the induced `e.m.f` inside the coil `Q` decreases and bulb `B` gets dimmer.
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