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836_Physics ProblemsTechnical Physics

836_Physics ProblemsTechnical Physics - 176 P29.50 Magnetic...

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176 Magnetic Fields P29.50 (a) V IB nqt H = so nqt I B V = = × = × H T 0.700 V T V 0 080 0 10 1 14 10 6 5 . . . Then, the unknown field is B nqt I V = F H G I K J H b g B = × × = = 1 14 10 0 330 10 0 037 7 37 7 5 6 . . . . T V V T mT e je j . (b) nqt I = × 1 14 10 5 . T V so n I qt = × 1 14 10 5 . T V e j n = × × × = × 1 14 10 0 120 10 2 00 10 4 29 10 5 19 3 25 3 . . . . T V A 1.60 C m m e j e je j . P29.51 B nqt V I = = × × × × H m C m V A b g e je je je j 8 49 10 1 60 10 5 00 10 5 10 10 8 00 28 3 19 3 12 . . . . . B = × = 4 33 10 43 3 5 . . T T µ Additional Problems P29.52 (a) The boundary between a region of strong magnetic field and a region of zero field cannot be perfectly sharp, but we ignore the thickness of the transition zone. In the field the electron moves on an arc of a circle: F ma = : q vB mv r v r q B m sin . . . 90 1 60 10 10 9 11 10 1 76 10 2 19 3 31 8 °= = = = × × = ×
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