A droplet of oil carries charge $-q$ and lies between two horizontal metal plates, as illustrated. The plates are separated by a distance $d$. It is found to remain at rest when the upper plate is at potential $+V$ and the lower plate is at potential $-V$. Under these conditions, what is the weight of the droplet?
- A$\frac{Vq}{d}$
- B$\frac{2Vq}{d}$
- C$\frac{Vd}{q}$
- D$\frac{2Vd}{q}$