A solid, flat aluminum disk rotates clockwise at a constant initial angular velocity in the plane of the page about a fixed central axis. A localized, uniform magnetic field \(\vec{B}\) is directed perpendicularly into the page over a small region at the top edge of the disk. As a segment of the disk enters this magnetic field region, eddy currents are induced in the disk, causing it to decelerate. Which of the following correctly identifies the direction of the magnetic force on the entering segment and explains the energy transformation responsible for the decrease in the disk's rotational kinetic energy?