Question:
The particle $P$ shown in figure has a mass of $10 \mathrm{mg}$ and a charge of $-0.01 \mu \mathrm{C}$. Each plate has a surface area $100 \mathrm{~cm}^{2}$. On one side. What potential difference $\mathrm{V}$ should be applied to the combination to hold the particle $\mathrm{P}$ in equilibrium?
Solution:
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