Suppose a uniformly charged wall provides a uniform electric field of 2 × 10^4 N / C normally. A charged particle of mass 2 g being suspended through…

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