Question

A series circuit consisting of an uncharged 2.0-µF capacitor and a 10-MΩ resistor is connected across a 100-V power source. What are the current in the circuit and the charge on the capacitor (a) after one time constant, and (b) when the capacitor has acquired 90 percent of its final charge?

A- (a) 10.0 µA, 0.2 mC (b) 9.0 µA, 45.0 mC

B- (a) 27.0 µA, 0.54 mC (b) 4.0 µA, 18.0 nC

C-(a) 3.7 µA, 0.13 mC (b) 1.0 µA, 0.18 mC

D- (a) 37.0 kA, 10.4 mC (b) 24.6 µA, 0.22 mC

Answer 1

For a charging RC circuit ,

Charge on the capacitor after time is

Current through the circuit at time is

a)

After on time constant,

Current through the circuit is

Charge on the capacitor is

b)

When the capacitor has acquired 90% of its final charge, that is

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Answer is