An uncharged capacitor is connected in series with a 4.0 kΩ resistor to a 12 V battery. What is the current at the instant the switch is closed?
Correct answer D. 3.0 mA
Explanation
At the moment of switching on the capacitor has no charge, so the voltage across it is zero and the full 12 V appears across the resistor: I = V/R = 12/4000 = 3.0 × 10⁻³ A.
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