CUET · PHYSICS · PYQ PAPER 2023
If a capacitor is connected in an ac circuit, what is the phase relationship between current and potential difference applied across the capacitor ?
- A The current leads the potential difference by \( \pi/2 \)
- B The current lags the potential difference by \( \pi/2 \)
- C The current and the potential difference are in the same phase
- D The current and the potential difference are in the opposite phase
Answer & Solution
Correct Answer
(A) The current leads the potential difference by \( \pi/2 \)
Step-by-step Solution
Detailed explanation
In a purely capacitive AC circuit, the current reaches its maximum value one-fourth of a cycle before the voltage does. Mathematically, if the applied voltage is \(V=V_0 \sin (\omega t)\), the resulting current is \(I=I_0 \sin (\omega t+\pi / 2)\), confirming that current leads…
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