P29_041 - is perpendicular to the ±eld. The magnitude of...

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41. If N closed loops are formed from the wire of length L , the circumference of each loop is L/N , the radius of each loop is R = L/ 2 πN ,andthea reao feachloopi s A = πR 2 = π ( L/ 2 πN ) 2 = L 2 / 4 πN
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Unformatted text preview: is perpendicular to the ±eld. The magnitude of the torque is then τ = NiAB = ( Ni ) µ L 2 4 πN 2 ¶ B = iL 2 B 4 πN . To maximize the torque, we take N to have the smallest possible value, 1. Then τ = iL 2 B/ 4 π ....
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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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