(a)[4]
Calculate the kinetic energy of the magnet as it reaches the lower end of the plastic tube.
(b(i))[2]
Explain why there is a current in the copper.
(b(ii))[2]
Explain why the magnet falls more slowly in the copper tube.
Physics 0625 · IGCSE · Electromagnetic effects
Electromagnetic effects — practice question
Fig. 8.1 depicts two vertical cylindrical tubes and a cylindrical magnet, all inside a vacuum.
One tube is plastic, whereas the other is copper. Both cylindrical tubes have the same dimensions.
The small cylindrical magnet has an extremely strong magnetic field.
At the beginning, the magnet is stationary at the top of the plastic tube.
It is released and drops through the plastic tube without any resistive force acting on it.
The time taken for the magnet to reach the lower end of the plastic tube is $0.67\,\text{s}$.