P. 4779. At a height of \(\displaystyle h\) above a broad grounded metal sheet there is a metal sphere of radius \(\displaystyle R\) in the air (\(\displaystyle R\ll h\)). The sphere is joined to the sheet with a very thin piece of metal wire. A point charge is brought near the sphere, such that its distance from both the sphere and the sheet is \(\displaystyle h\). Then we first remove the wire and after the charge. What will the potential difference between the sphere and the sheet be?
Deadline expired on 10 December 2015.