Discussion
An eddy current brake develops its retarding torque from
Answer: A
Correct answer: currents induced in a rotating conducting disc
A conducting disc turning in a magnetic field has eddy currents induced in it, and by Lenz’s law the force on those currents opposes the motion. The braking torque is smooth, contactless and free of wear, and the energy appears as heat in the disc. Because the induced emf is proportional to speed, so is the current and roughly so is the torque - which is why the brake fades to nothing as the machine stops.
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