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I have a thin wand of insulating material. The wand is bent so as to form a semicircle of radius $R=20 cm$. The wand is a uniformly distributed charge $q= 5\ 10^{-9} C$. Calculate the electric field in the center O.

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This looks like a homework. – C.R. Jun 20 '12 at 15:34
added homework tab for utility of other searches – Nic Jun 20 '12 at 16:07
Hi Balboa, and welcome to Physics Stack Exchange! This is a site for conceptual questions about physics, not general homework help. If you can edit your question to ask about the specific physics concept that is giving you trouble, I'll be happy to reopen it. See our FAQ and homework policy for more information. – David Zaslavsky♦ Jun 20 '12 at 16:10

closed as too localized by David Zaslavsky♦ Jun 20 '12 at 16:10

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