# Homework Help: Two Spherical Capacitors - Pleas Help Friends!

1. Feb 20, 2005

### jay3050

Hello Everybody, I am new to this site, However I have a quick question about the two spherical capacitors.

http://online.physics.uiuc.edu/cgi/courses/shell/phys112/summer04/tmau.pl?04/05 [Broken]

If you need any more clarification please let me know!

Thank You very Much!

Last edited by a moderator: May 1, 2017
2. Feb 20, 2005

### StatusX

To calculate the capacitances, put a charge +Q on the inner sphere and -Q on the outer and find the voltage difference that results. Then C=Q/V, and this can be used in the usual way to get the answers to the second part.

3. Feb 20, 2005

### Integral

Staff Emeritus
What is you question? Please show us something of what you have done. Yes the caps are in series.

4. Feb 20, 2005

### jay3050

Two Capacitors

Hello all,

I have the found the capacitance of the spheres by using

(4*pi*Epsilon(0)*a*b)/(b-a) where a & b are in meters, for the first one and for the second capacitance i used the above formula and multiplied it by the k!

All I need help is, is with finding the charge Q on the inner and and the outer surface, All I could possibly think about it is that it they are in series!

Thanks

5. Feb 20, 2005

### Staff: Mentor

Good.

Two hints:
In going around the circuit, what must the voltages add to?
Since the inner conductors are connected, what must be their total charge?

6. Apr 11, 2010

### nonequilibrium

Is it actually possible? The inner shell wouldn't feel a thing of the outer applied voltage, would it? (being a conductor in electrostatic equilibrium)