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The demonstration on the top left show a rectangular loop is rotating about the z axis in an x y z plane. A current I is flowing upward along the z axis in the presence of a uniform field B toward the positive y axis.

A graph on the bottom left shows, a sinusoidal curve of current that completes a cycle with respect to the time. .

A text on the left reads a rectangular wire loop of area A rotates at an angular frequency omega in a constant magnetic flux density b sub o. The purpose of the demo is to illustrate how the current varies in time relative to the loop’s position. Note the direction of the current and its magnitude as indicate by its brightness. I sub max equals omega B sub o A.