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leonne

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## Homework Statement

Find the electric field distance z above one end of the straight line segment of length L which carrys uniform charge

## Homework Equations

de=1/4pie Eo (Q/r^2) r^

## The Attempt at a Solution

This was an example in a book and have few questions about it what they did was

using that formula de=1/4pie Eo (dQ/r^2) cos@

then plugs in, de=1/4pie Eo (y dx/(z^2+x^2) ) (z/(z^2+x^2)^1/2 y is the uniform charge.

My question is why did they do this as in how did they figure out r^2= (z^2+x^2) that dq= ydx and that r^ = cos@

I am bad at setting up the physics problem, i have no problem after everything is set up to solve it.

Thanks