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Q.

The variation of the instantaneous current (I) and the instantaneous emf (E) in a circuit is as shown in fig. Which of the following statements is correct

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a

The voltage lags behind the current by π / 2

b

The voltage leads the current by π / 2

c

The voltage and the current are in phase

d

The voltage leads the current by π

answer is B.

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Detailed Solution

At t = 0, phase of the voltage is zero, while phase of the current is -π2  i.e., voltage leads by  π2
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