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Capacitance of a Random Conductor

The circuit p...

Question

The circuit pictured above shows a battery, a resistor and an uncharged capacitor with labeled values of voltage, resistance and capacitance. The circuit also includes a switch, which can be opened (as pictured) or closed.
What is the value of the current in the circuit at the instant the switch is closed?

A

2.0 A

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B

8.0 A

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C

128 A

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D

4.0 A

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E

No current flows (0 A).

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Solution

The correct option is A 2.0 A
When the switch S is just closed, the capacitor will start to charging through resistor. Thus, now the capacitor acts as a short circuit. Thus, the current in the circuit by Ohm's law, $I = V / R = 16 / 8 = 2 A$

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