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## Homework Statement

A square with sides d has charges q, 2q, 3q and 4q arranged

clockwise around the corners of the square. What are the

magnitude and direction of the field at the centre of the square?

Hints: consider pairs on opposite sides of the square. Choose a

coordinate system that makes finding components easy

## Homework Equations

E=F/q=kq/r^2

## The Attempt at a Solution

I have drawn a diagram, and I believe that I need to just calculate E for each charge, however I don't know how to approach it. Since now sign (-ve/+ve) is given for any particles how do I determine the direction of the electric field. Thanks in advance