A 5 microfarad capacitor is connected in series with a key and a cell of emf 1.5v and internal resistance 1.2 ohm.what will be the potential difference across the capacitor 3 microseconds after closing the key.
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If a resistor is connected in series with the capacitor forming an RC circuit, thecapacitor will charge up gradually through the resistor until the voltage across it reaches that of the supply voltage. The time required for the capacitor to be fully charge is equivalent to about 5 time constants or 5T.
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