problem29_76

problem29_76 - 29.76 a As the bar starts to slide the flux...

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29.76: a) As the bar starts to slide, the flux is decreasing, so the current flows to increase the flux, which means it flows from . to b a b) The magnetic force on the bar must eventually equal that of gravity. φ φ ε cos ) cos ( 2 2 2 R B vL vL R LB dt dA B R LB dt d R LB R LB iLB F B B = = = Φ = = = . cos tan cos tan 2 2 2 2 φ φ φ φ B L Rmg v R B L v mg F t t g = = = c) . tan cos ) cos ( 1 1 LB mg R B vL vL R B dt dA B R dt d

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Unformatted text preview: = d) . tan 2 2 2 2 2 2 B L g Rm R i P = = e) , tan sin cos tan ) 90 cos( 2 2 2 2 2 2 2 B L g Rm P B L Rmg mg Fv P g g = ⇒ =-° = which is the same as found in part (d)....
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