A loop of wire is placed in a time-varying magnetic fi eld B, inducing an emf in

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A loop of wire is placed in a time-varying magnetic fi eld B, inducing an emf in the loop whose magnitude varies with time as sketched in Figure P21.57 (top). Which of the graphs below shows how B varies with time?


 Graph 1 Graph 2 Graph 3 B B Figure P21.57

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