What is the Potential Difference VC-VA in the Electric Field Problem?

[BuBbLeS01]

Potential difference please help!

Homework Statement

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?

Homework Equations

Uel = qV

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.

 

[quantumdude]

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 $V_B$?