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