If plates at x₁ = 1 and x₂ = 10 are kept at potentials U₁ = 220 V, U₂ = 2kV, is the potential at x = 5 larger or smaller than the potential at r = 5 ? No calculation. Give reason.

Data from Prob. 12

Find the potential and complex potential between the coaxial cylinders of axis 0 (hence the vertical axis in space) and radii r₁ = 1 cm, r₂ = 10 cm, kept at potential U₁ = 220 V and U₂ = 2 kV, respectively.