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Mathematical Methods for Physics and Engineering - Matematica.NET

Mathematical Methods for Physics and Engineering - Matematica.NET

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PDES: SEPARATION OF VARIABLES AND OTHER METHODSy−λ+λr 0r 3C xx 0y 0V+λr 2−λr 1Figure 21.13 The arrangement of images <strong>for</strong> finding the <strong>for</strong>ce on a linecharge situated in the (two-dimensional) quarter-space x>0, y>0, when theplanes x =0<strong>and</strong>y = 0 are earthed.terms of x 0 <strong>and</strong> y 0 , the total <strong>for</strong>ce on the line charge due to the charge induced on theplates is given by(F =λ2− 1 j + 2x 0 i +2y 0 j− 1 )i2πɛ 0 2y 0 4x 2 0 +4y2 02x 0( )λ 2 y2= −04πɛ 0 (x 2 0 + y2 0 ) i + x2 0j . ◭x 0 y 0Further generalisations are possible. For instance, solving Poisson’s equation inthe two-dimensional strip −∞

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