Two spheres of radii r1 and R2 joined by a fine wire are raised to a potential V

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Two charged spherical conductors of radii R1 and R2 are connected by a wire. Then the ratio of surface charge densities of the spheres σ1/σ2 is

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11.

Two charged spheres separated by a distance d exert some force (F) on each other. If they are immersed in a liquid of dielectric constant 4, then what is the force exerted, if all other conditions are same ?

D.

F4

     Fi = 14πε0q1q2d2      ..... (i)    Ff = 14πε0k q1q2d2or Ff = 14 14πε0q1q2d2  = 14F         [from eqn (i)]

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