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Calculating charge of a capacitor and current in a circuit

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Hi. Can someone please walk me through how to do the following problem?

The capacitor in an RC circuit (R = 120 ohms, C = 45 micro-F) is initially charged. Find (a) the charge on the capacitor and (b) the current in the circuit one time constant after the circuit is connected to a 9.0-V battery."

Thank you.

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Solution Summary

This solution provides a brief calculation for charge and current in the circuit at a particular time.

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