A square wire loop 3.0 m on a side is perpendicular to a uniform 2.0-T magnetic field. A 6-V light bulb is in series with the loop, as shown in Fig. 27.38. The magnetic field is reduced steadily to zero over time ?t. (a) Find ?t such that the bulb will shine at full brightness. (b) Which way will the loop current flow?

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000 B FIGURE 27.38 Problem 39