A circular loop of wire lies in the xy plane so that the axis of the loop

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A circular loop of wire lies in the x–y plane so that the axis of the loop lies along z (Fig. P21.18). A magnetic field of magnitude B is parallel to the z axis. This field is positive (i.e., along the z direction) and is the same everywhere within the area of the loop. If B is decreasing with time, what is the direction of the induced current in the loop as viewed from above?


 х Figure P21.18

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