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A magnet is pushed towards a coil. The induced current in the coil flows in a direction that
AIs perpendicular to the magnet's velocity always
BEquals zero by symmetry
CAids the motion of the magnet
DOpposes the motion of the magnet (Lenz's law)
Answer & Solution
Correct answer: D. Opposes the motion of the magnet (Lenz's law)
Lenz's law: the coil-end facing the approaching N-pole becomes an N-pole itself, repelling the magnet and opposing the motion. Energy comes from the work done by whoever pushes the magnet.
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