 #1
 4
 0
Homework Statement
In the circuit below, at time t = 0, the switch is closed, causing the capacitors to charge. The voltage across the battery is 12 V. **Image of circuit is attached.
A)Calculate the time constant for the RC circuit
B)Calculate the time required for the voltage across the capacitor to reach 6 V
C)What will be the net charge stored in the capacitor after 10 nanoseconds?
Homework Equations
Time constant (TC)= R*C
q= qo[1e^(t/TC)]
The Attempt at a Solution
A)
TC= [(C1+C2)*(R1*R2)]/(R1+R2)
TC= [(3μF+6μF)*(4kΩ*2kΩ)]/(4kΩ+2kΩ)
TC= 12 ms = 0.012 sec Correct/Incorrect???
B)
q= qo[1e^(t/TC)]
6= 12[1e^(t/12)]
t= 8.316 ms = 0.008316 sec Correct/Incorrect??? Also unsure about my setup and math.
C) I cannot find an equation to solve for this and don't know how. Please Help!
Homework Statement
Homework Equations
The Attempt at a Solution
Attachments

17.6 KB Views: 468