My teacher worked out the following problem as shown below:(adsbygoogle = window.adsbygoogle || []).push({});

http://img116.imageshack.us/img116/7656/naamloos27mf.gif [Broken]

The only thing is I don't really understand what he's doing, so could anybody please explain to me a bit more which steps he takes? I would be very greatful! (or maybe there's an easier way to solve it....)

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# Homework Help: Calculating E in a hemispherical shell using Coulomb's law

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