Homework Answers
Ans. The voltmeter reads emf induced in the nearby coil. The emf in the coil is directly proportional to the negative time rate of the change of the current. So the emf induced in the coil is direction proportional to the slope of the current(ammeter reading) vs time graph.
1) For t < t1 the slope is positive and constant, so the voltmeter reads + constant value ( due to the connection of the terminals of the voltmeter)
2) For t1 <= t <= t2 , the slope is zero, so the reeading of the voltmeter is zero.
3) For t2 <= t <= t3 , the slope is negative and constant, hence the voltmeter reads a negative constant value.
4) For t3 <= t <= t4 , the slope is zero, hence the voltmeter reads zero.
Hence graph d shows the time dependence of the voltmeter reading.
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