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A sphere carrying a charge of Q having w...

A sphere carrying a charge of Q having weight w falls under gravity between a pair of vertical plates at a distance of d from each other. When a potential difference V is applied between the plates the acceleration of sphere changes as shown in the figure, to along line BC. The value of Q is

A

`(w)/(V)`

B

`(w)/(2V)`

C

`(wd)/(V)`

D

`(sqrt2wd)/(V)`

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