Abstract
A proper-energy method is used to find the energy of attraction between two dielectric slabs. Independent derivations of the attractive force are also presented.
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References
SchwingerJ., Lett. Math. Phys. 24, 59–61 (1992).
SchwingerJ., Lett. Math. Phys. 1, 43–47 (1975).
SchwingerJ., DeRaadL., and MiltonK., Ann. Phys. 115(1), 1–23 (1978). This paper is somewhat more general in that the two slabs need not have the same dielectric constant. That apart, the force expression consists of two contributions of which the first, electric, term agrees with what is found here. According to [3], the second, magnetic, term is produced by the substitution κ′ → κ′/ε.