Magnetic aggression #1
Electricity and Magnetism
Level
2
In a long hollow vertical metal pipe a magnet is dropped. During it's fall ,the acceleration of magnet
may increase or decrease
will decrease linearly
will decrease to zero and will attain a terminal speed
will decrease upto a value which is less than
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1 solution
This can be solved by using application of Lenz's Law. By Lenz's law ,as the magnet falls ,induced amount will in the metal pipe that will oppose the fall and thus magnetic force acting on a magnet due to induced current will oppose it's motion and increase it's magnitude which is directly proportional to velocity ,thereafter achieving terminal velocity after some time.