Faraday’s law, then, (with SI units and 3 significant figures understood) leads to ()00200lnln229ln10910ln.2Bibbddaadidtdtb ab a dtbadttbadtbtabaµµεµ⎡⎤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 =×−−FHGIKJ=×−−410016 9 3102012016 012598 1077ππchbgbg.ln...V(b) We note that /0di 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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