Question

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

• A. The voltage lags behind the current by $\frac{\Pi }{2}$
• B. The voltage leads the current by $\frac{\Pi }{2}$
• C. The voltage and the current are in phase
• D. The voltage leads the current by $\Pi$

Answer 1

The correct option is B The voltage leads the current by $\frac{\Pi }{2}$

At t = 0, phase of the voltage is zero, while phase of the current is $-\frac{\pi }{2}$ i.e., voltage leads by $\frac{\pi }{2}$