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Quiz16-2007-102 - a F = iL B B= 0i 2d i F = iL 0 2d 2 i L0...

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d i L F d L i F d i iL F d i B B iL F π µ π µ π µ π µ 2 2 2 2 0 2 0 2 0 0 = = = = × = ρ a) b) 2 0 4 4 . 2 4 0 0 4 4 4 2 4 4 2 4 2 2 sin cos 2 2 2 2 2 2 2 0 2 2 0 2 2 2 2 0 2 2 2 2 0 2 2 0 2 0 1 2 1 d z z d z d z z z d i B dz d d z iz B d z z d z i d z z d z i B d z r r i B r i B B B B eff eff eff effective ± = = + + = = + = + + + + + = + = = = = + π µ π µ π µ π µ π µ π µ α θ This is where B becomes maximum on the z
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