A conducting spherical shell of ineer radius a and outer radius b carries a net charge Q. A point charge q is placed at the center of this shell. Determine the surface charge densit on (a) the ineer surface of the shell and (b) the outer surface of the shell.(adsbygoogle = window.adsbygoogle || []).push({});

I'm not sure of my reasoning. For part (a), I argued that at the inner surface

E = q/ (4*pi*a^2*epsilon) from Gauss' law.

And equated that to the formula for electric field, right outside a conductor in electro-static equilibrium i.e.

E = (surface charge density)/ epsilon.

So I get q/ (4*pi*a^2). Is that correct? If not, what would the correct method be.

Any advice pls. Thanks.

PS I apologize for the ugly equations. Still learning how to use the equation editor...

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Electrostatic equilibrium and Gauss' law

**Physics Forums | Science Articles, Homework Help, Discussion**