Suppose a uniformly charged wall provides a uniform electric field of $2 \times 10^4 \mathrm{~N} / \mathrm{C}$ normally. A charged particle of mass 2 g being suspended through a silk thread of length 20 cm and remain stayed at a distance of 10 cm from the wall. Then the charge on the particle will be $\frac{1}{\sqrt{\mathrm{x}}} \mu \mathrm{C}$ where $\mathrm{x}=\left[\right.$ use $\left.g=10 \mathrm{~m} / \mathrm{s}^2\right]$