A conducting spherical shell of radius R has a charge Q. A small sphere of radius `r_(0) (r_(0) lt R)` currying a charge g is introduced inside the large shell. What is the potential
i. at a point r `(r gt r_(0))` due to inner sphere
ii. it at a point r=R
iii. at a point `r=r_(0)`

Explanation

`i. V_(0)=(1)/(4pi epsi_(0)) q/r`
ii. `V=(1)/(4pi epsi_(0)R) [Q+e]`
iii. `V=1/(4pi epsi) [q/r_0+Q/R]`