1. Jan 17, 2008

### BuBbLeS01

1. The problem statement, all variables and given/known data
It takes 3.3 μJ of work to move a 34.26 nC charge from point A to B. It takes -3.3 μJ of work to move the charge from C to B. What is the potential difference VC-VA?

2. Relevant equations
Uel = qV

3. The attempt at a solution
Don't I just find the difference between A and C?
Vc = Uelc * qc = 1.13x10^-13
And Va would be the same so I know I am not understanding this.

2. Jan 17, 2008

### Tom Mattson

Staff Emeritus
Let's do this in pieces.

Since only potential differences are physically significant, you can set the potential at zero at any point you want. Let's set $V_A=0$. Since it takes negative work to move a charge from A to B, is $V_B$ less than, greater than, or equal to $V_A$? Can you compute $V_B$?