Question

How do you get a magnet to stick to aluminium?

Answer 1

Some materials are weakly attracted by an externally applied magnetic field and produce internal, induced magnetic fields in the direction of the applied magnetic field, which is known as paramagnetism. Diamagnetic materials, on the other hand, are repelled by magnetic fields and produce induced magnetic fields in the opposite direction of the applied magnetic field.

Complete answer:
Aluminium is paramagnetic, which means that under a strong magnetic field, it is only faintly magnetic. It is difficult to adhere a magnet to aluminium because the magnetism is so weak. A typical magnet will not stick to metal under normal conditions. However, under the appropriate circumstances, a powerful magnet may interact with aluminium, but not to the level that it can with ferrous metals. A powerful magnet may impact any electrically conducting metal, even if nonferrous metals are not magnetic. Inducing an electric current to flow through usually nonmagnetic metal is one technique to affect it.
The oscillations of the magnetic field can generate an electric current in aluminium if it is twisted into a coil and fed past a strong permanent magnet. This field has its own polarity and may be manipulated to attract or repel the process's stronger magnet.

Note:
Aluminium (aluminum in American and Canadian English) is a chemical element with the symbol Al and atomic number 13. Aluminium has a density lower than those of other common metals, at approximately one third that of steel. It has a great affinity towards oxygen, and forms a protective layer of oxide on the surface when exposed to air. Aluminium visually resembles silver, both in its color and in its great ability to reflect light. It is soft, non-magnetic and ductile.