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**1. Homework Statement**

The drawing shows a uniform electric field that points in the negative y direction; the magnitude of the field is 3000 N/C. Determine the electric potential difference (a) VB - VA between points A and B, (b) VC - VB between points B and C, and (c) VA - VC between points C and A.

http://edugen.wiley.com/edugen/courses/crs2216/art/qb/qu/c19/ch19p_56.gif

**2. Homework Equations**

**3. The Attempt at a Solution**

I was able to solve the first two parts of this problem easily but I am hung up on how the angle of the triangle plays into this.

I know A is zero because they are on the same equipotential field.

B I solved by converting the distance to meters and multiplying that by the magnitude of the electric field.

For C I know that it will be a combination of both the vertical and horizontal direction and I know that I am supposed to find that by using sin or cos but I just cant seem to put it together!