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AP Physics 2
12.4 Electromagnetic Induction and Faraday’s Law
AdvancedMCQMathematicalConceptual15k
A circle representing a solid metal disk is centered at the origin of a two-dimensional view in the plane of the page. A central pivot point is marked with a small black dot. A curved arrow labeled \(\omega\) curves clockwise above the disk. At the top edge of the disk (at the 12 o'clock position), a shaded square region represents a localized magnetic field containing evenly spaced 'X' symbols, labeled \(\vec{B}\). An arrow labeled \(\vec{v}\) points horizontally to the right at the top edge of the disk entering the square region. No other labels, lines, text, or axes appear.
A solid metal disk rotating clockwise through a localized magnetic field perpendicular to the disk.
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?

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