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

  • A
    The voltage lags behind the current by $\pi / 2$.
  • B
    The voltage leads the current by $\pi / 2$.
  • C
    The voltage and the current are in phase.
  • D
    The voltage leads the current by $\pi$.

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