Electric Potential Energy and micro-joules

[8008jsmith]

Homework Statement

A uniform electric field of 16.9 N/C is directed in the positive x direction. If a charge of -2 micro-coulombs moves 2.2 meters in the negative x direction, how much does the electric potential energy change in micro-joules?

Homework Equations

ΔEPE = qEd

The Attempt at a Solution

Since the charge is moving against the field the change in EPE should be positive, therefore I just plugged in the numbers and got 111.04. That answer was wrong, however, but I have no idea why. Any help would be appreciated.

 

[Doc Al]

Since the charge is moving against the field the change in EPE should be positive,

But it's a negative charge.

 

[Doc Al]

I just plugged in the numbers and got 111.04

Redo that calculation as well.

 

[Brian T]

Also, make sure your units are all on the same scale.