854_Physics ProblemsTechnical Physics

854_Physics ProblemsTechnical Physics - 194 Sources of the...

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Unformatted text preview: 194 Sources of the Magnetic Field P30.17 By symmetry, we note that the magnetic forces on the top and bottom segments of the rectangle cancel. The net force on the vertical segments of the rectangle is (using Equation 30.11) F F F i i F i F i = + = + F H G I K J = + F H G I K J = F H G I K J = 1 2 0 1 2 0 1 2 7 5 2 1 1 2 4 10 5 00 10 0 0 450 2 0 150 0 250 2 70 10 I I c a c I I a c c a A A . . . . . . a f e j a f a f a f a fa f e j N A A A m m 0.100 m m N 2 or F = 2 70 10 5 . N toward the left . FIG. P30.17 *P30.18 To attract, both currents must be to the right. The attraction is described by F I B I I r = = 2 2 90 2 A A sin So I F r I 2 0 1 6 7 2 320 10 2 0 5 4 10 20 40 0 = = F H G G I K J J = A N m m N s C m A A e j a f e j a f . . FIG. P30.18 Let y represent the distance of the zero-field point below the upper wire....
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