Class Examples for Chapter 29-1

Class Examples for Chapter 29-1 - Class Examples for...

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1 Class Examples for Chapter 29 5. (a) We find the field by superposing the results of two semi-infinite wires (Eq. 29-7) and a semicircular arc (Eq. 29-9 with = rad). The direction of B is out of the page, as can be checked by referring to Fig. 29-6(c). The magnitude of B at point a is therefore 7 3 0 0 0 1 1 (4 10 T m/A)(10 A) 1 1 2 1.0 10 T 4 2 2 2(0.0050 m) 2 a i i i B R R R       upon substituting i = 10 A and R = 0.0050 m. (b) The direction of this field is out of the page, as Fig. 29-6(c) makes clear. (c) The last remark in the problem statement implies that treating b as a point midway between two infinite wires is a good approximation. Thus, using Eq. 29-4, 7 4 00 (4 10 T m/A)(10 A) 2 8.0 10 T. 2 (0.0050 m) b ii B RR   (d) This field, too, points out of the page. 8. In the one case we have B small + B big = 47.25 T, and the other case gives B small B big = 15.75 T (cautionary note about our notation: B small
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Class Examples for Chapter 29-1 - Class Examples for...

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