(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

http://i39.tinypic.com/qsp1rr.jpg

Determine the magnitude of the electric field at point P.

2. Relevant equations

lambba=(q/l)

Length of arc = (radius)(radians)

There's another equation with a sin60 in it that gives the answer, but I forgot what it is...

3. The attempt at a solution

I first tried getting lambda by diving the charge 8e-6C by the length of the arc, .418m, then put that in this equation:

[(lambda)/(4piEo)]int(1/r^s) but that didn't give me the right answer, which is 1.49e6 N/C upwards.

I know the answer and most of the information, I just don't know what equation to apply to it.

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# Homework Help: Magnitude of electric field by a curved rod.

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