1220_Physics ProblemsTechnical Physics

1220_Physics ProblemsTechnical Physics - Chapter 43 Section...

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Chapter 43 561 Section 43.8 Superconductivity P43.46 (a) See the figure at right. (b) For a surface current around the outside of the cylinder as shown, B NI = µ 0 A or NI B == × ×⋅ = A π 0 2 7 0540 250 10 41 0 10 7 .. . T m TmA kA af ej . FIG. P43.46 P43.47 By Faraday’s law (Equation 32.1), ∆Φ B t L I t A B t . Thus, I AB L × = bg b g 00100 00200 310 10 203 2 8 . m T H A. The direction of the induced current is such as to maintain the B– field through the ring. P43.48 (a) VI R = If R = 0 , then V = 0 , even when I 0. (b) The graph shows a direct proportionality. Slope mA mV == = = = 1 155 57 8 361 1356 43 1 00232 1 R I V R . . . (c) Expulsion of magnetic flux and therefore fewer current-carrying paths could explain the
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