faois3nh

2022-10-13

Drop a small bar magnet through a vertical plastic pipe, noting its speed of fall. Then do the same with a copper pipe. Whoa! Why the diference?

Annabella Ferguson

We will consider that in this physical situation, the magnetic force between two moving point charges is given by $F=-\frac{{\mu }_{0}}{2\pi }\frac{qvI}{r}$
Also, we know that the magnetic domains are defined as clustered regions of aligned magnetic atoms. If a strong magnetic field effect the material of clustered regions of random magnetic fields, then the magnetic field lines will rearrange and align in the direction of the strong magnetic field direction that we called magnetization phenomena.
As we know some materials have the ability to magnetization while the others have not As we know the copper has the ability to magnetization while plastic hasn't.
Solve for the case of plastic:
As we mentioned the plastic pipe hasn't the ability to magnetize. So, when a small magnet falls through the plastic pipe, the pipe will not suffer any magnetization and the only affected force on the magnet is gravity.
Solve for the case of copper:
As we mentioned the copper pipe has the ability to magnetize. So, when a small magnet falls through the copper pipe, the pipe will be magnetized and the affected forces on the magnet are gravity and the attraction force due to the magnetic induction. Since the magnetic force is much higher in order than the gravitational force. Therefore, the magnet will fall slowly.

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