869_Physics ProblemsTechnical Physics

869_Physics ProblemsTechnical Physics - Chapter 30 P30.69...

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Chapter 30 209 P30.69 There is no contribution from the straight portion of the wire since d sr ×= ± 0. For the field of the spiral, d I d r B I d r I dr r B I rd r I r B = × == F H G I K J L N M O Q P = = zz z µ π θ 0 2 0 2 0 2 0 2 0 2 0 2 0 2 0 1 0 2 4 44 2 3 4 1 af bg ej ± sin ± sin FIG. P30.69 Substitute re = : B I e I ee I e =− = −− ππ 0 0 2 0 20 0 2 4 1 out of the page. P30.70 (a) BB M =+ 00 M = 0 0 and M = 0 0 Assuming that B and B 0 are parallel, this becomes M = 0 0 . The magnetization curve gives a plot of M versus B 0 . (b) The second graph is a plot of the relative
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