A point charge q of mass m is kept at a distance d below a grounded infinite conducting sheet which lies in the xy plane. For what value of d will the charge remain stationary?
1
\(\frac{q}{4 \sqrt{mg\pi \epsilon_0}} \)
2
\(\frac{q}{ \sqrt{mg\pi \epsilon_0}} \)
3
no finite value
4
\(\frac{\sqrt{mg\pi \epsilon_0}}{q } \)