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(D) In a pure inductor,the current lags behind the voltage by a phase angle of $\pi/2$ or $90^\circ$.If the voltage is represented as $V = V_m \cos(\o

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(D) In a pure inductor,the current lags behind the voltage by a phase angle of $\pi/2$ or $90^\circ$.If the voltage is represented as $V = V_m \cos(\omega t)$,then the current is given by $i = I_m \cos(\omega t - \pi/2) = I_m \sin(\omega t)$.The given voltage graph is a cosine wave starting at its maximum value at $t = 0$.Since the current lags the voltage by $90^\circ$,the current graph should be a sine wave starting from zero at $t = 0$ and increasing in the positive direction.Comparing this with the given options,the graph that represents a sine wave starting from zero at $t = 0$ is Option $D$.

The voltage across a pure inductor is represented by the following diagram. Which of the following diagrams will represent the current?

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