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Asked Mar 10, 2020
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Consider a small deformation of the walls of a cavity, such as represented by Fig. 7-1. Take the  formula [Eq. (7-45)), which requires no boundary conditions on E, and take the unperturbed cavity field E0 as a trial field. Show that Eq. (7-45) reduces to

Show that this formula is essentially the same as Eq. (7-4).

 

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