EC > GATE 2016 SET-1 > Electrostatics
Concentric spherical shells of radii 2 m, 4 m, and 8 m carry uniform surface charge densities of 20 nC/m2, -4 nC/m2 and ρs, respectively. The value of ρs (in nC/m2) required to ensure that the electric flux density D=0 at radius 10 m is
Correct : -0.25
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