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Homework Statement
A solid ball of radius rb has a uniform charge density ρ.
What is the magnitude of the electric field E(r) at a distance r>r_b from the center of the ball?
Homework Equations
E(r) = (Q/ε)*1/Area
The Attempt at a Solution
If Q=ρrb
and Area = (4/3)πr3,
then E(r) = [itex]\frac{ρrb}{ε*(4/3)*πr3}[/itex]
However,
the correct answer is in the image attached.
E(r)=