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## Homework Statement

(a) Find the resultant force on a negative charge of -3q, placed at the center of a square of side b, which has charges on the 4 corners, respectively, q, 2q, -4q, 2q in clockwise order. (Magnitude and direction)

## Homework Equations

F= k*q1*q*(1/ r^2)

Ftotal= F

_{15}+ F

_{25}+ F

_{35}+ F

_{45}

## The Attempt at a Solution

I drew the figure, and see that r = square root 2 *b* (1/2)

(pythagorean theorem)

One question is that F25 and F45 are equal and opposite. Do they cancel eachother out? If so, I wouldn't have to calculate the forces for those, yes?

I'm just a little confused. Sorry if it's super easy.