Solving a problem in physics section 68 point 18 electr

18. A solid ebonite ball (dielectric constant ε = 3) with a radius R = 10 cm is uniformly charged with a bulk density ρ = 5 nC / m3. Determine the electric displacement D and the intensity E of the electrostatic field: 1) at a distance r1 = 3 cm from the center of the ball; 2) at a distance of r2 = 15 cm from the center of the ball.