A sphere carrying 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 sphere carrying 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
$\frac{{2wd}}{V}$
- B
$\frac{{wd}}{{2V}}$
- C
$\frac{{wd}}{V}$
- D
$\frac{{\sqrt 2 wd}}{V}$
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- [AIEEE 2012]