Homework Help: physics

Posted by Edward on Tuesday, June 28, 2011 at 4:36pm.

if a 5microfarad capacitor is charged by a 20volts battery and it is then connected across an uncharged 20microfarad capacitor , find the potential energy

physics - bobpursley, Tuesday, June 28, 2011 at 5:21pm
Find the PE of what?
physics - Damon, Tuesday, June 28, 2011 at 5:25pm
5*10^-6 = Q/20
Q = 10^-4

That charge is distributed on the new capacitance of C = (5+20)10^-6 = 25 *10^-6

V = Q/C
V = 10^-4/(25*10^-6) = 10^2/25 = 4 Volts

Energy = (1/2) Q V = .5 *10^-4 * 4
= 2*10^-4 Joules

Answer this Question

Related Questions

Physics - A parallel plate capacitor with plate separation d is connected to a ...
AP PHYSICS - A 3.0-uF capacitor and a 4.0-uF capacitor are connected in series ...
,xsccmbd - 80 moicro farad capcitor is connected to 220 volt battery it is then ...
physics - Having trouble with this one: A capacitor having a capacitance of 10uF...
physics please help!! - A parallel plate capacitor with plate separation d is ...
physics - If three unequal capacitors, initially uncharged, are connected in ...
Physics - A parallel-plate capacitor has a capacitance of 2.1 µF with air ...
Physics - A)Two identical resistors are connected in parallel across a 30-V ...
Physics - A)Two identical resistors are connected in parallel across a 30-V ...
Physics - Review Conceptual Example 11 before attempting this problem. An empty ...

For Further Reading

First Name:
School Subject:
Answer: