# physics

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the region 0 < r < r1 is a charged insulating sphere with
uniform charge density _E, the region r1 < r < r2 contains free space, and the
region r2 < r < r3 is an insulating spherical shell with uniform charge density
��_E.
What is the electric field in the regions:
(a) 0 < r < r1 = 0
(b) r1 < r < r2
(c) r2 < r < r3
(d) r3 < r
(e) For which regions does the electric field have the same r dependence as the
field due to a point charge?

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