A long, nonconducting, solid cylinder of radius 3.0 cm has a nonuniform volume charge density ρ that is a function of radial distance r from the cylinder axis: ρ = k/r where k is a constant. If the electric field strength is 7.23×105 N/C at r = 1.5 cm, what is the value of k (μC/m2)? 6.4 27 2.6 42 14.4 2.8 7.0 51.6 3.7 4.3