Question a 40 microf capacitor is connected in series with, Ask an Expert

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Question: A 4.0 µF capacitor is connected in series with a 2.0 kohm resistor across a 20-V DC source and an open switch.

Part A: If the switch is closed at t = 0 s, what is the charge on the capacitor at t = 9 ms?

Please give me an explanation for above question.

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