Solve Prob. 15 if the sector is -1/8 < Arg z < 1/8. Data from Prob. 15

Solve Prob. 15 if the sector is -1/8π < Arg z < 1/8π.

Data from Prob. 15

By applying a suitable conformal mapping, obtain from FIG. 406 the potential Φ in the sector -1/4π < Arg z < 1/4π such that Φ = -3kV if Arg z = -1/4π and Φ = 3kV if Arg z = 1/4π.