Posted by **UNKNOWN** on Thursday, May 27, 2010 at 3:58am.

TWO series capacitors ( one 1 microFarad, the other of unknown value ) are charged from a 12 Voltage source. The 1 microFarad capacitor is charged to 8 Voltage and the other to 4 Voltage. What is the value of the unknown capacitor?

- MATH. (physics) -
**drwls**, Thursday, May 27, 2010 at 7:12am
I don't see why they both don't charge to the full 12 V, if they are charged separately or in parallel.

What you seem to be talking about is charging them together in Series. In that case, the sum of the voltages is the supply voltage (12 V), and they both hold the same charge.

Therefore Q = C1*V1 = C2*V2

1 uF * 8 V = x * 4 V

x is the unknown capactitance, and you can solve for it.

x = (8/4) * 1 uF = 2 uF = 2*10^-6 F

(uF stands for microFarads)

- MATH. -
**UNKNOWN.**, Thursday, May 27, 2010 at 6:03pm
Thankyou drwls.

## Answer This Question

## Related Questions

- physics - lets say two capacitors C1 and C2 1uF each are connected in series ...
- physics - lets say two capacitors C1 and C2 1uF each are connected in series ...
- Physics2 - A 2.0-microFarad capacitor is charged to 50V and then connected in ...
- physics - Three capacitors are connected to a battery of unknown voltage as ...
- Physics - What value of voltage will be reached across the plates of a capacitor...
- Physics - A series RCL circuit contains only a capacitor (C=6.60 F), an ...
- physics - Capacitor A has a capacitance CA =29.4 uF and us initially charged to ...
- Physics - A q = +3.00 mC test charge is placed inside a constant uniform ...
- Physics - The drawing shows two fully charged capacitors (C1 = 7 µF, q1 = 4 µC; ...
- Physics - Two fully charged capacitors (C1 = 2.00uF, q1=6.00uC,C2=8.00uF, q2 = ...

More Related Questions