Unformatted text preview: is less than R , we solve µ ε r 2 dE dt = µ ε R 4 dE dt for r . The result is r = R/ 2 = (55 . 0 mm) / 2 = 27 . 5 mm. To ±nd the one that is greater than R , we solve µ ε R 2 2 r dE dt = µ ε R 4 dE dt for r . The result is r = 2 R = 2(55 . 0 mm) = 110 mm....
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 Fall '08
 SPRUNGER
 Physics

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