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Within a spherical charge distribution of charge density ρ(r),N equipotential surfaces of potential V0,V0+V,V0+2V,..........V0+NV(V>0), are drawn and have increasing radiir0,r1,r2,..........rN, respectively. If the difference in the radii of the surfaces is constant for all values of V0 and V then :

(1)ρ(r)r(2)ρ(r)=constant(3)ρ(r)1r(4)ρ(r)1r2

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