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9. The spherical region, 0 <r < 10 cm, contains a uniform volume charge density p. =
4 μC/m³. (a) Find Qe 0 <r< 10 cm. (b) Find D.. 0<r < 10 cm. (c) The nonuniform
volume charge density, p,= -3/(r +0.001) nC/m³, exists for 10 cm <r<ro. Find
re so that the total charge, 0 <r<ro, is zero.

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