Question

Consider a solid hemisphere of radius R having charge Q/2. The electric potential at a point at a distance of R/2 from the centre of the sphere on the flat surface of hemisphere is

Answer 1

The electric potential at a distance r from the centre is given by

V=KQ/2R *(3-(r/R)^2)
Here r=R/2 and Q1=Q/2

V=K(Q/2)/2R * (3-(0.5)^2
V=KQ/4R *(3-0.25)
V=KQ/4R*2.75