In a circuit consisting of a capacitance and a generator with alternating emf Eg = Eg0 sin ω t, VC and IC are the voltage and current. Correct phasor diagram for such circuit is (a) (b) (c) (d)

Answer: (c). For a capacitor, IC leads VC by π/2. Phasors rotate anticlockwise, so IC must be 90° anticlockwise from VC. Option (c) shows VC at angle ω t and IC at ω t + 90°. So the answer is (c).

In a circuit consisting of a capacitance and a generator with… | JEE Main 2021 (22 Jul, Shift 2)

Q51JEE Main 2021 · 22 JUL · SHIFT 2Easy

Pure R, L and C Circuits

In a circuit consisting of a capacitance and a generator with alternating emf Eg = Eg0 sin $\omega$ t, VC and IC are the voltage and current. Correct phasor diagram for such circuit is

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Answer: (c)

For a capacitor, $I_C$ leads $V_C$ by $\frac{\pi}{2}$ .
Phasors rotate anticlockwise, so $I_C$ must be $90^\circ$ anticlockwise from $V_C$ .
Option (c) shows $V_C$ at angle $\omega t$ and $I_C$ at $\omega t + 90^\circ$ .
So the answer is (c).

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