Two metal plates (A, B) are kept horizontally with separation of (12/(π)) cm, with plate A on the top. An atomizer jet sprays oil (density 1.5 g /…

Two metal plates $\displaystyle (A, B)$ are kept horizontally with separation of $\displaystyle \left(\frac{12}{\pi}\right) \mathrm{cm}$, with plate A on the top. An atomizer jet sprays oil (density $\displaystyle 1.5 \mathrm{~g} / \mathrm{cm}^3$ ) droplets of radius $\displaystyle 1$ mm horizontally. All oil droplets carry a charge $\displaystyle 5 \mathrm{n} C$. The potentials $\displaystyle V_A$ and $\displaystyle V_B$ are required on plates A and B respectively in order to ensure the droplets do not descend. The values of $\displaystyle V_A$ and $\displaystyle V_B$ are $\displaystyle \_\_\_\_$. (Neglect the air resistance to the droplets and take $\displaystyle \mathrm{g}=10 \mathrm{~m} / \mathrm{s}^2$ )