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**1. Homework Statement**

Four charges are located at the corners of a square as shown below. Calculate the magnitude and direction of the net force on charge -3Q and charge 4Q.

(sorry don't have picture, but it is of a square with corners -Q, 2Q, -3Q, and 4Q clockwise).

**2. Homework Equations**

F= K(q1)(q2)/r^2

K= 8.99x10^9

**3. The Attempt at a Solution**

I don't understand how to start with the information I've been given, it seems like its not enough.