Lenz's Law and Gravity

A mass \(M\) pulls the conducting bar through a vertically oriented magnetic field. A mass MM pulls the conducting bar through a vertically oriented magnetic field.

In the above picture, a mass MM falls under the influence of gravity, pulling with it a conducting bar of mass mm, resistance RR, and length \ell that sits on a U-shaped piece of metal in a vertically oriented magnetic field perpendicular to the plane of the U, pointing in the positive-z direction. In which direction does the induced current flow?

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