A capacitor opposes the flow of alternating current. This opposition is called Capacitive Reactance ( $X_{C}$ ). $X_{C} = \frac{1}{ω C} = \frac{1}{2 π f C}$

$X_{C}$ is inversely proportional to frequency ( $f$ ).
For DC ( $f = 0$ ), $X_{C} = \infty$ (capacitor acts as an open circuit).
Current leads voltage by $9 0^{\circ}$ in a purely capacitive circuit.

This easy difficulty physics question is from the chapter electromagnetic induction and ac, covering the topic of capacitive reactance. It appeared in the 2025 exam.

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Capacitive Reactance

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