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

To find the potential at a distance \( r \) (where \( r < R \)) inside a dielectric sphere of uniform charge density \( \rho \), radius \( R \), and dielectric constant \( \epsilon_r \), we can follow these steps:

### Step 1: Understand the Setup
We have a sphere of radius \( R \) with a uniform charge density \( \rho \). We need to find the electric potential at a point inside the sphere at a distance \( r \) from the center.

### Step 2: Determine the Total Charge Inside the Sphere
The total charge \( Q \) within a sphere of radius \( R \) is given by:
\[
...