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851_Physics ProblemsTechnical Physics

851_Physics ProblemsTechnical Physics - Chapter 30*P30.11(a...

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Chapter 30 191 *P30.11 (a) Above the pair of wires, the field out of the page of the 50 A current will be stronger than the ± k e j field of the 30 A current, so they cannot add to zero. Between the wires, both produce fields into the page. They can only add to zero below the wires, at coordinate y y = − . Here the total field is B = µ π 0 2 I r + µ π 0 2 I r : 0 2 50 0 28 30 50 30 0 28 50 30 0 28 20 30 0 28 0 420 0 = + + L N M M O Q P P = + = = = − µ π A m A m m m at m y y y y y y y y . ± ± . . . . d i e j e j d i b g b g a f k k FIG. P30.11 (b) At y = 0 1 . m the total field is B = µ π 0 2 I r + µ π 0 2 I r : B k k k = × + F H G I K J = × 4 10 2 50 0 28 30 0 10 1 16 10 7 4 π π T m A A 0.10 m A m T . ± . ± . ± a f e j e j e j . The force on the particle is
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