Let the cylindrical surfaces ρ = 4 cm and ρ = 9 cm enclose two wedges of perfect dielectrics, ϵr1 = 2 for 0 < ϕ<π/2 and ϵr2 = 5 for π/2<ϕ<2π. If E1 = (2000/ρ)aρ V/m, find (a) E2; (b) the total electrostatic energy stored in a 1 m length of each region.
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