Topic: Reactance, impedance, LCR series circuit, resonance· Electromagnetic Induction and Alternating Currents

An ac source is connected to a capacitor C. Due to decrease in its operating frequency :

1. capacitive reactance remains constant

2. capacitive reactance decreases.

3. displacement current increases.

4. displacement current decreases.

Doubtly Asked 30 Oct 2026 NEET UG 2023 Practice test neet Save WhatsApp Report

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Answer: 4. displacement current decreases.

Capacitive reactance \(X_C=\dfrac{1}{2\pi fC}\).

When the frequency decreases, \(X_C\) increases. The current (and the displacement current between the plates, which equals the conduction current in the wires) is \(I=V/X_C\), so it decreases.

Options 1 and 2 are wrong because \(X_C\) rises, and option 3 is wrong because the current falls.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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An ac source is connected to a capacitor C. Due to decrease in its operating frequency :

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