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April 18, 2015

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Posted by **habtamu** on Saturday, August 11, 2012 at 7:35am.

- physics -
**drwls**, Saturday, August 11, 2012 at 10:39amCharge per unit length along the semicircle is Q/(pi*R). Net field E will be perpendicular to the diameter that runs from one end to the other. Use Coulomb's Law and integrate along the semicircle.

E = [kQ/(pi*R)]*[R*d(theta)/R^2]*

Integral of cos theta from -pi/2 to pi/2.

k is the Coulomb constant.

I get E = 2 k Q/(pi*R^2)

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