| In the below figure, a bar magnet is quickly moved towards a conducting loop having a capacitor. Predict the polarity of the plates A and B of the capacitor. |
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Answer:
As, the magnet moves towards the coil, magnetic flux linked with the coil increases, hence according to the Lenz's law it will oppose the change. Here, the North pole is approaching the magnet, so the induced current in the face of loop viewed from left side will flow in such a way that it will behave like North pole. So, South pole is developed in the loop when viewed from right hand side of the loop. The flow of induced current is clockwise. Hence, A acquires positive polarity and B acquires negative polarity.
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