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i'm new here...i got here with a question...

i want to calculate the electric field in the middle of half sphere with raduse R ,

so..i made a rings out of the sphere,ds,which in fact is (2PI*R^2)sin(teta)d(teta), and tried to integrate from 0 to PI/2.

i did get something...i'd like to know if i'm right or not...

thanks:)