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1. A capacitor charging circuit consists of a battery, an uncharged 20 μF capacitor, and a...

1. A capacitor charging circuit consists of a battery, an uncharged 20 μF capacitor, and a 4.8 kΩ resistor. At t = 0 s the switch is closed; 0.15 s later, the current is 0.62 mA . What is the battery's emf?

2. A 10 μF capacitor initially charged to 30 μC is discharged through a 1.2 kΩ resistor. How long does it take to reduce the capacitor's charge to 10 μC?

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