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a positive point charge q sits at the center of a hollow spherical shell. The shell, with radius R and negligible thickness, has net charge -2q. find an expression for the for the electric field strength (a) inside the sphere, r<R (b) outside the sphere, r>R. in what direction does the electric field point in each case.

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  1. Have you tried using Gauss' law?

    It is well suited to problems like this.

    http://hyperphysics.phy-astr.gsu.edu/HBASE/electric/elesph.html

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