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    Can anyone explain why the answer's B. doesnt a capacitor take the same time to charge as to discharge (5RC). shouldnt the answer be D
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    When the switch is opened, the capacitor is discharging through the resistor which is in series with it. When the switch is closed again, the resistor and the capacitor are each in parallel with the power supply and therefore the potential difference across the capacitor is the same as that across the resistor i.e. the potential difference across the power supply.

    Graph D would be correct if a resistor was in series with the capacitor during discharge and charging.
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    Thanks for the explanation, really helpful


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