Coaxial conducting cylinders are located at ρ = 0.5 cm and ρ = 1.2 cm. The region between the cylinders is filled with a homogeneous perfect dielectric. If the inner cylinder is at 100 V and the outer at 0 V, find (a) the location of the 20 V equipotential surface; (b) Eρmax; (c) ϵr if the charge per meter length on the inner cylinder is 20 nC/m.
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