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p=p_0(1-r/R)

the charge density decreases linearly from p_0 at the center to zero at the edge of the sphere.

1) show that p_0= 3Q/pi*R^3

to find this i used p*volume=Q

Q/volume=p

p_0(1-r/R)=Q/volume and the volume of a sphere is 4/3pi*r^3

is this right??