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A dielectric sphere of radius R and dielec-
tric constant e, is hollowed out in the re-
gion 0 < R1 <R and a thin grounded
conducting shell is inserted at r
The sphere is placed in a uniform exter-
nal electric field E = Eoê along the z-axis.
Calculate the potential in the region r2 R.
R1
E,

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