# Potential between concentric spheres

1. Apr 22, 2017

### Kara386

1. The problem statement, all variables and given/known data
A particle charge q and mass m moves in a circle radius r between two concentric spheres which are a distance d apart, where d<<r. There's a potential V between spheres. Find an expression for this potential.

2. Relevant equations

3. The attempt at a solution
Can I assume that these are like parallel plates so that $E = \frac{V}{d}$? The $F = qE$ and I can equate that to centripetal force. I'm just not sure if I can say that a sphere inside a spherical shell, which I assume is what the question means, would behave like that because of the curvature.

Thanks for any help!

2. Apr 22, 2017

### CWatters

That's what I would do.