# Homework Help: Electric potential of sphere

1. Feb 9, 2009

### ktbobabee@aol

1. The problem statement, all variables and given/known data
A nonconductive sphere has radius R=2.31 cm and uniformly distributed charge q==3.5 fC. Take the electric potential at the sphere's center to be V=0. What is V at the radical distance r=1.45cm and at r=2.31 cm

2. Relevant equations
Gauss' Law
V=E*ds

3. The attempt at a solution
E=kqr/R^3
then V=E*ds
I keep getting an answer that is 20 times smaller then the actual.
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Feb 10, 2009

### Gokul43201

Staff Emeritus
Your second equation "V=E*ds" is not correct. The RHS is a differential element, while the LHS is not. Besides, what is "s"?

Please show your work more explicitly. With what you've shown so far, there is no way one can tell you exactly where your error is.