P27_042 - 42. (a) Since P = i2 R = J 2 A2 R, the current...

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42. (a) Since P = i 2 R = J 2 A 2 R , the current density is J = 1 A r P R = 1 A s P ρL/A = s P ρLA = s 1 . 0W π (3 . 5 × 10 5 · m)(2 . 0 × 10 2 m)(5 . 0 × 10 3 m) 2 =1 . 3 × 10 5 A / m 2 . (b) From P = iV = JAV weget V = P AJ = P πr 2 J
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.

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