Electrostatics Part 3

Suppose a uniformly charged wall provides a uniform electric field of 2×104N∕C normally. A charged particle of mass 2g being suspended through a silk thread of length 20‌cm and remain stayed at a distance of 10‌cm from the wall. Then the charge on the particle will be ‌

1

√x

µC where x=....[. use g=10m∕ s2]