Lenz's Law, Eddy Currents & Induced Electric Field
A hollow metal pipe is held vertically and bar magnet is dropped through it with its length along the axis of the pipe. The acceleration of the falling magnet is ( acceleration due to gravity)
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Answer: (b)
- The moving magnet induces eddy currents in the metal pipe.
- By Lenz's law these oppose the fall, giving an upward retarding force.
- So acceleration is less than , answer (b).