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A non-conducting sphere of radius R = 5.0 cm carries a charge Q = 3.0 mC...

A non-conducting sphere of radius R = 5.0 cm carries a charge Q = 3.0 mC distributed uniformly throughout its volume. At what distance, measured from the center of the sphere, does the electric field reach a value equal to half its maximum value?

can someone please explain where the Qr^3/R^3 comes from? Why is it cubed?

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