844_Physics ProblemsTechnical Physics

844_Physics ProblemsTechnical Physics - 184 Magnetic Fields...

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184 Magnetic Fields P29.12 288 . ± j ej N P29.50 (a) 37 7 . mT; (b) 429 10 25 3 . × m P29.52 (a) 17.9 ns; (b) 35.1 eV P29.14 109 mA to the right P29.54 39 2 . mT P29.16 4 3 12 IdBL m F H G I K J P29.56 (a) B x is indeterminate. B y = 0; B F ev z i i = ; P29.18 F ab = Fi bc =− 40 0 . ± mN ; Fk cd 40 0 . ± mN ; k da =+ 40 0 . ±± mN af (b) F i ± j ; (c) F i ± j P29.58 128 mT north at an angle of 78.7 ° below the horizontal P29.20 (a) 5 41 . m Am 2 ; (b) 4 33 m Nm P29.60 3 4 R P29.22 (a)3 97 . ° ; (b) 3 39 m P29.24 (a) 80 1 . mNm ; (b) 104 mN m ; P29.62 B ~10 1 T; τ 1 ; I ~1 A; A 3 m 2 ; N 3 (c) 132 mN m ; (d) The torque on the circle. P29.64 λθ g I tan P29.26 (a) minimum: pointing north at 48.0° below the horizontal; maximum: pointing south at 48.0° above the horizontal; P29.66 (a) 0 104 . mm; (b) 0 189 m m (b) 1 07 J µ P29.68 382 10 25 . × kg P29.28 (a) 640 N m ; (b) 241 mW; (c) 2.56 mJ; (d) 154 mW P29.70 (a) see the solution; empirically,
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