A ball of radius R carries a positive charge with volume density depends only on a distance r from the ball's centre as function p = p0(1-r/R) where p0 is constant. Assuming the dielectric permittivity of the ball and the environment to be equal to unity , find ;
(a) the magnitude of the electric field intensity as a function of the distance r both inside and outside the ball
(b) the maximum intensity Emax and the corresponding distance rm
(c) draw the graphics
Thanks a lot.