P27_007 - 7. The cross-sectional area of wire is given by A...

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7. The cross-sectional area of wire is given by A = πr 2 ,wh e r e r is its radius (half its thickness). The magnitude of the current density vector is J = i/A = i/πr 2 ,so r = r i πJ = s
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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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