ch30-p024

# ch30-p024 - 24. (a) First, we observe that a large portion...

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Faraday’s law, then, (with SI units and 3 significant figures understood) leads to () 00 2 0 0 ln ln 22 9 ln 10 91 0 ln . 2 B ib b dd a a d i dt dt b a b a dt b ad tt bad t bt a ba µµ ε µ ⎡⎤ Φ ⎛⎞ =− ⎜⎟ ⎢⎥ π− ⎝⎠ ⎣⎦ −− = With a = 0.120 m and b = 0.160 m, then, at t = 3.00 s, the magnitude of the emf induced in the rectangular loop is = ×− F H G I K J 4 10 016 9 3 10 2 012 016 012 598 10 7 7 π π ch bg b g . ln . .. V (b) We note that /0 di dt > at t = 3 s. The situation is roughly analogous to that shown in Fig. 30-5(c). From Lenz’s law, then, the induced emf (hence, the induced current) in the loop is counterclockwise. 24. (a) First, we observe that a large portion of the figure contributes flux which “cancels out.” The field (due to the current in the long straight wire) through the part of the
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