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The current i in a coil varies with time as shown in the figure. The variation of induced emf with time would be

1. emf graph (a)
2. emf graph (b)
3. emf graph (c)
4. emf graph (d)

Correct answer: emf graph (b)

Solution

The induced emf is proportional to the rate of change of current (Faraday's Law). The graph of emf will correspond to the slope of the current-time graph. Based on the given options, graph (b) correctly represents the variation of emf with time.

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