Practicing Success
In an ac circuit, the current leads the voltage by $\pi / 2$. The circuit is _________. Fill in the blank with the correct answer from the options given below. |
purely resistive should have circuit elements with resistance equal to reactance purely inductive purely capacitive |
purely capacitive |
$ V = V_0 sin\omega t$ $\Rightarrow q = CV_0 sin \omega t $ $\Rightarrow I = \frac{dq}{dt} = CV_0\omega cos\omega t= CV_0sin(\omega t + \frac{\pi}{2})$ Current lead voltage by $\frac{\pi}{2}$. Hence the circuit is purely capacitive. The correct answer is Option (4) → purely capacitive |