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AP Physics C: E&M/Unit 11 – Electric Circuits
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RC Circuit Initial Current Estimation
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A capacitor discharges through a resistor. During the initial 0.12 s of discharge, a total of $$3.6 \times 10^{-3}$$ C of charge leaves the capacitor. The charge $$Q$$ remaining on the capacitor at time $$t$$ is described by the equation $$Q(t) = Q_0 e^{-t/RC}$$. Without knowing the values for the time constant $$RC$$ or the initial charge $$Q_0$$, what is the best estimate for the initial current, $$I_0$$, in the circuit?

A

3.0 × 10^-1 A

B

1.5 × 10^-2 A

C

4.3 × 10^-4 A

D

3.0 × 10^-2 A

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