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Three spherical surfaces located at r= 2m, 4m and 6m have uniform surface charge densities of...

Three spherical surfaces located at r= 2m, 4m and 6m have uniform surface charge densities of 20 ??/?2, -4 ??/?2 and ??0 , respectively, a) Find the electrical flux density D at r=1m, 3m and 5m. b) Determine ??0 such that D=0 at r=7m

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