Question: A long, nonconducting, solid cylinder of radius 4.0 cm has a nonuniform volume charge density that is a function of radial distance r from

A long, nonconducting, solid cylinder of radius 4.0 cm has a nonuniform volume charge density ρ that is a function of radial distance r from the cylinder axis: ρ = Ar2. For A = 2.5 µC/m5, what is the magnitude of the electric field at
(a) r = 3.0 cm and
(b) r = 5.0 cm?

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