A phenomenon where a magnetic material temporarily
acquires magnetic properties when a magnet is brought
near it, is called magnetic induction.
This method is generally used to make temporary
magnets. The magnetic properties of the substance
disappear the moment the influence of the magnetising
substance is removed.
Is this physics?
Is there a question?
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That's correct! The phenomenon you're describing is called magnetic induction. It involves the temporary magnetization of a material when it is brought close to a magnet. The magnetic properties of the material are induced by the magnetic field produced by the magnet.
To understand how magnetic induction works, it's helpful to know that magnetic materials are made up of tiny atomic magnets known as magnetic domains. In an unmagnetized material, these domains point in random directions, causing the overall magnetic effect to cancel out.
When a permanent magnet is brought near the material, its magnetic field aligns the magnetic domains in the material, causing them to temporarily become magnetized. This alignment occurs as the magnetic field of the magnet exerts a force on the electrons within the material, causing them to align in the same direction.
However, once the influence of the magnet is removed, the domains within the material gradually return to their random orientations, causing the magnetic properties to disappear. This is why it is referred to as a temporary magnet.
Magnetic induction has various applications, such as in electromagnets, transformers, and magnetic card readers. It is a fundamental principle in magnetism and a crucial concept in understanding how magnets and magnetic materials work.