What is potential at a distance `r (lt R)` in a dielectric sphere of uniform charge density `rho`, radius R and dielectric constant `epsilon_(r)`.

Explanation

`V_(A)=V_(B)+(W_(B rarr A))/(q)`
`V=(Q)/(4pi in_(0)R)+underset(R)overset(r)int (rho r)/(3 in_(0)in_(r))(-dr)=(Q)/(4 pi in_(0)R)+(rho (R^(2)-r^(2)))/(3 in_(0) in_(r))`
`V_("outside")=(KQ)/(r)`