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Two non-conducting solid spheres of radii R and 2R, having uniform volume charge densities roh1 and roh2, respectively to each other. The net electric field at distance 2R from the center of the smaller sphere, along the line joining the centers of the spheres is zero. The ration of roh1/roh2 can be:
A) -4
B) -32/25
C) 32/25
D) 4

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