Help please Drop a short cylindrical bar magnet down a vertical copper pipe (Fig
ID: 1337336 • Letter: H
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Help please
Drop a short cylindrical bar magnet down a vertical copper pipe (Fig. L). A short cylindrical bar magnet is dropped down a vertical copper pipe of slightly large diameter, about 1.0 m long. It takes several seconds to merge at the bottom, whereas it takes a fraction of a second to make the trip in the air. Why? The "jumping ring" (Fig. R). If you wind a solenoid coil around an iron core (the iron is there to beef up the magnetic field). Place an aluminum ring on top, and press the switch button, the ring will jump several feet in the air. Why?Explanation / Answer
5. Due to induced emf in the pipe(according to len's law),the magnetic field generate in upward direction , hence a force(F) generate on the magnet in upward direction and net force on the magnet is dounward direction is less than the force of gravity , which is equal to' mg-F', so it takes the several seconds in compare to freely fall condition in air.
6. when switch is close at this time current is flow in the circuit and that cause magnetic field generate across it and magnetic force induced in the upward direction so ring will jump several feet in the air
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