A 12-V battery is connected to three capacitors in series. The capacitors have t

Question

A 12-V battery is connected to three capacitors in series. The capacitors have the following capacitances: 4.0 µF, 10.6 µF, and 32.2 µF. Find the voltage across the 32.2-µF capacitor.

(a) What capacitance must be used in this circuit if the time constant is to be 3.7 ms? I ANSWERED 21.89 and it was correct I need help with part b

(b) Using the capacitance determined in part (a), calculate the current in the circuit 5.0 ms after the switch is closed. Assume that the capacitor is uncharged initially and that the EMF of the battery is 9.0 V. its not .0532

3) A 12-V battery is connected to three capacitors in series. The capacitors have the following capacitances: 4.0

Explanation / Answer

2)

Total voltage = 25V.
"Internal resistance" of battery = 9.5 ohms.
Total circuit resistance = (9.5 + 6.22 + 15.1) = 30.82 ohms.
Current = (25/30.82) = 0.81116A.
Direction of current flow = clockwise (conventional) or anticlockwise (electron flow)

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