Q 12-07-123JEE MainJEE Main 2021 (22 Jul, Shift 1)Easy
In a circuit consisting of a capacitance and a generator with alternating emf, $E_g = E_{g0}\sin\omega t$, $V_C$ and $I_C$ are the voltage and current. Correct phasor diagram for such circuit is
Answer: (C) see figure
In a purely capacitive circuit the current leads the voltage by $90^\circ$. In the phasor diagram the $I_C$ phasor must be $90^\circ$ ahead (anticlockwise) of the $V_C$ phasor.
In (3), $V_C$ is at angle $\omega t$ and $I_C$ at $\omega t + 90^\circ$, which is correct. (1) shows the current lagging, (2) in phase and (4) opposite in phase.
Solution by Sreeraj P, M.Sc Physics