The function is a complex potential of a two-dimensional electrostatic field.
(a) Show that the equipotential curves φ(x, y) = c1 and the lines of force ψ(x, y) = c1 are, respectively
Observe that the equipotential curves and the lines of force are both families of circles.
(b) The centers of the equipotential curves in part (a) are (coth c1, 0). Approximately, where are the centers located when c1 → ∞? When c1 → −∞? Where are the centers located when c1 → 0+? When c1 → 0−?
(c) Verify that each circular line of force passes through z = 1 and through z = −1.
(d) Use a CAS or graphing software to plot representative circles from each family on the same coordinate axes. If you use a CAS do not use the contour plot application.
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