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## Homework Statement

The problem is to find the electric force between two rods one beside the other. a charge of Q is distributed over the rods uniformly each of length 2x. The centre of each rod is d from the others centre.

-----Rod 1------- ------Rod 2-------

## Homework Equations

[tex]F= \frac{qq}{Kr^2}[/tex]

[tex]Efield= \frac{q}{Kr^2}[/tex]

## The Attempt at a Solution

I know I am supposed to find the electric field over the whole distance then integrate the the length of one rod (I think) but I don't understand at all why this work

I would set the electric field up by

dq = Q/2x (Charge density) * dx

E= dq/(Kr^2) I think. then I am not even sure if I did that right and I think I'm supposed to integrate this over the length of 1 of the rods but I don't understand how that gives you force. Any help would be appreciated thanks!

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