The electric potential at the centre of hemisphere of radius R having uniform surface charge density σ is
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
From a uniformly charged disc of radius R having surface charge density σ, a disc of radius R2 is Removed as shown. What is the electric potential at point P?