Q. An inductor is connected to an AC source. When compared to voltage , the current in the lead wires
A) Is ahead in phase by $\pi$
B) Lags in phase by $\pi$
C) Is ahead in phase by $\frac{\pi}{2}$
D) Lags in phase by $\frac{\pi}{2}$
Explanation
(d) In a purely inductive circuit, current is
$i = i_{0}\sin\left( \omega t - \frac{\pi}{2} \right)$
[image:7_image60.jpeg]
Which shows that the current lags behind the emf by a phase angle of $\frac{\pi}{2}$ or $90{^\circ}$ or the
emf leads the current by a phase angle of $\frac{\pi}{2}$ or $90{^\circ}$.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.