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What happens to the capacitor when the capacitor voltage is equal to the source voltage?

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What happens to the capacitor when the capacitor voltage is equal to the source voltage?

(a) The charging phase of the capacitor is over

(b) The discharging phase of the capacitor is over

(c) The capacitor is switched off

(d) The capacitor is switched on

This question was posed to me during an interview.

My question is based upon Charging and Discharging Currents in division Capacitance and Capacitors of Basic Electrical Engineering

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The correct choice is (c) The capacitor is switched off

Best explanation: When the capacitor voltage is equal to the source voltage, it means that all the charges have moved from one plate of the capacitor to the other. Hence the capacitor is fully charged and we say it gets switched off.

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