Two identical point charges are fixed to diagonally opposite corners of a square that is 0.395 m on a side. Each charge is 4.0 x 10-6 C. How much work is done by the electric force as one of the charges moves to an empty corner

The work done by the electric force as one of the charges moves to an empty corner is:

Explanation:

The electric force between these points charges are:

(1)

Where:

k is the coulomb constant ()

q(1) the first charge

q(2) the second charge

r is the distance between them

The distance r is the distance of the diagonal of the square.

Then, using the equation (1) the electric force will be:

If we want to find the work done by the electric force we need to use the component of the force in the x or y direction because is the direction of the empty corner.

I hope it helps you!