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A solid shere of radius R carries a char...

A solid shere of radius R carries a charge Q distributed uniformly over its valume. A very small point like piece of it of mass m gets detached from the bottom of the sphere and falls down vertically under gravity. This piece carries charge q. If it acquires a speed v when it has fallen through a vertical height y (seefigure), then :(assume the remaining protion to be spherical).

A

`v^2 = y [(qQ)/(4piin_0R^2ym) + g]`

B

`v^2 = y [(qQ)/(4piin_0R(R + y) m)+g]`

C

`v^2 = 2y [ (qQR)/(4piin_0(R + y)^3m) + g]`

D

`v^2= 2y[(qQ)/(4piin_9R (R +y) m) + g]`

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