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Homework Statement
One ,non uniform but spherical in symmetry distribution of charge has charge density which is given by the following equations
ρ=ρο(1-r/R) when r< R and ρ=0 when r>R, ρ0=3Q/πr^3 and it is constant
a) show that the total charge included by this distribution is equal to Q
b)show that for r>R the electric field is the same that occurs as if it comes from a point charge
c)find an expression for the electric field for the area r<R
Homework Equations
the equations i used was gauss law and Qenc= integral pdV
i hope u understand i don't to write yet in latex
The Attempt at a Solution
I solved a and b and i can't think about c
i know that the desired expression is E=(p0r/12ε0)(4-3r/R)