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Unformatted text preview: ef of a medium with many empty spherical cavities of radius R , carved at random points in a uniform Ohmic conductor (see Fig. on the right), in the limit of small sphere concentration, n << R3 . Hint : Try to use the analogy with a dielectric media. Problem 7.3 (15 points). Find voltage drop V between two corners of a square cut from a uniform sheet with Ohmic conductivity, induced by dc current I which is passed between its two other corners (see Fig. on the right). Hint : Try to use the dc current analog of the charge image method. R I ? V t R 2...
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 Fall '08
 Stephens,P
 Resistance, Work

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