Q. The variation of the instantaneous current $(I)$and the instantaneous $e$mf $(E)$ in a circuit is as shown in fig. 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 $\pi$
Explanation
(b) At $t = 0$, phase of the voltage is zero, while phase of the current is $- \frac{\pi}{2},\ i.e.,$ voltage leads by $\frac{\pi}{2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.