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Coil A is connected to an ac source thro...

Coil A is connected to an ac source through a switch S. Coil B, kept close to A, is connected to a low voltage bulb (L). Explain the following observations.
(i) When S is closed, the bulb lights up.
(ii) With S closed if B is moved away from A, the bulb gets dimmer.
(iii) With S closed, if a copper plate C is inserted between the coils, the bulb gets dimmer.

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