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A solid conducting sphere of radius a carries a net positive
charge 2Q. A conducting spherical shell of inner radius b
and outer radius c is concentric with the solid sphere and car-
ries a net charge -Q. Using Gauss's law, find the electric
field in the regions labeled 1, 2, 3, and 4 in Figure 24.19
and the charge distribution on the shell when the entire sys-
tem is in electrostatic equilibrium.
-Q
2Q

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