# Homework Help: Conducting sphere in E-field

1. Mar 22, 2006

### sachi

I've solved an electrostatics problem where we have to find the surface charge density on a conducting sphere in a previously uniform E-Field, but I had to assume that V=0 on the surface of the cylinder, and I'm not sure why this is the case. I know that E=0 inside, so the potential should be constant, but I don't see why it should be zero (is this an extra assumption, or is there something else I'm missing?)