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Mathematical Methods for Physics and Engineering - Matematica.NET

Mathematical Methods for Physics and Engineering - Matematica.NET

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25.9 EXERCISESimaginary z-axes, find the strengths of the field (a) at a point one metre directlyabove the fence, (b) at ground level one metre to the side of the fence, <strong>and</strong> (c)at a point that is level with the top of the fence but one metre to the side of it.What is the direction of the field in case (c)?25.3 For the function( ) z + cf(z) =ln ,z − cwhere c is real, show that the real part u of f is constant on a circle of radiusc cosech u centred on the point z = c coth u. Use this result to show that theelectrical capacitance per unit length of two parallel cylinders of radii a, placedwith their axes 2d apart, is proportional to [cosh −1 (d/a)] −1 .25.4 Find a complex potential in the z-plane appropriate to a physical situation inwhich the half-plane x>0, y = 0 has zero potential <strong>and</strong> the half-plane xa, s =0<strong>and</strong>thehalf-plane r

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