866_Physics ProblemsTechnical Physics

866_Physics ProblemsTechnical Physics - 206 P30.59 Sources...

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206 Sources of the Magnetic Field P30.59 Model the two wires as straight parallel wires (!) (a) F I a B = µ π 0 2 2 A (Equation 30.12) F B = × × = 41 01 4 020 1 0 0 2 1 00 10 246 7 2 3 ππ ej af a f . . . N u p w a r d (b) a mg m loop loop loop 2 N ms = = 107 . upward FIG. P30.59 P30.60 (a) In d r Id Bs r 0 2 4 ± , the moving charge constitutes a bit of current as in In q v A = . For a positive charge the direction of d s is the direction of v , so d r nqA ds Bv r 0 2 4 a f ± . Next, Ads a f is the volume occupied by the moving charge, and nA ds a f = 1 for just one charge. Then, r 0 2 4 r q ± . (b) B = ×⋅ × × × °= × −− 4 10 1 60 10 2 00 10 4 1 00 10 90 0 3 20 10 71 9 7 3 2 13 TmA C T e j e j .. . sin . . (c) Fq B = × × × ° vB 1 60 10 2 00 10 3 20 10 90 0 19 7 13 . s i n . C m s T e j F B 102 10 24 . N directed away from the first proton
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