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A bar magnet falling into a vertical copper tube on the lab bench drops more slowly than in free fall because:
AThe copper is denser than the air around the magnet
BFriction with the tube walls slows the magnet directly
CThe magnetic field of the tube attracts the magnet up
DEddy currents in the tube oppose the magnet's fall by Lenz's law
Answer & Solution
Correct answer: D. Eddy currents in the tube oppose the magnet's fall by Lenz's law
Induced eddy currents in the copper tube oppose the change in flux (Lenz), braking the magnet.
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