Due to a thin homogeneous plate of radius 'a' and thickness k, the potential will be at the point on its axis which is at a distance p from the centre.
1
\(\rm 2 \pi {rpk}[\sqrt{a^2+b^2}-b] \)
2
2πrpk
3
\(\rm 2 \pi {rpk}[\sqrt{a^2+b^2}-a]\)
4
none of these