Question

What is the potential inside a non conducting sphere ? Also at the centre of that sphere?

Formula without derivation could also help

Answer 1

Electric potential is work done on a unit positive charge to bring it from infinity to that particular distance. You can calculate the electric potential V using V =-(integtal E.dr). In this case you will have to integrate from infinity to ‘r’ use the above formula from

infinity to R using E = kq/(R*R) which gives you kq/RR to r using the E = kqr/(R*R*R) which gives you kq(r*r)/(2*R*R*R) - kq/2R

Adding the above two will give you kq/2R - kq(r*r)/(2*R*R*R)