The intensity of the electrostatic field inside and on the surface of a sphere charged with a constant bulk density ρ is expressed by the formula E = ρ * r / 3εo; Where r 0 is the distance from the center of the sphere. Find the expression for the potential φ (r) of points inside the ball. Calculate the potential difference between the center of the ball and the surface of the ball if the radius of the ball is R = 10cm, ρ = 50 nC / m3.

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