Four capacitors are connected across a 90-V DC source as shown in the figure abo

Question

Four capacitors are connected across a 90-V DC source as shown in the figure above. What is the charge on the 4.0- mu F capacitor? What is the charge on the 4.0- mu F capacitor? An RC circuit consists of 2.0 M ohm in series with a capacitor. When connected to a battery, the capacitor becomes 25% charged in 15 seconds. What is the capacitance value? A 2.0 mu F capacitor is charged to 12. V and then discharged through 4 times 10^6 ohm. How long will it take for the voltage across the capacitor to drop to 3.0 V?

Explanation / Answer

12) V=Voe^-t/RC

V/Vo =0.25

0.25=e^-1.5/2e6*C

ln(0.25)=-1.5/2e6*C

C= 18.48 MF

13) V=Voe^-t/RC

3/12= e^-t/RC

ln(0.25)=-t/4e6*2e-6

t=173.3 ms

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