Magnetic induction is the process by which substances like iron are magnetized by magnetic field.

The process of decreasing magnetic property or losing it completely is called demagnetization.

The activities that make magnet lose its magnetic properties are:

  1. Dropping regularly from the table or height.
  2. Rubbing against diamagnetic substances.
  3. Bringing similar poles closer by applying external force.
  4. Using the magnet for making other magnets.
  5. By heating the magnet.
  6. By passing the magnet in a copper coil of alternating current (AC) and pulling it against the direction of current.

 Some of the ways to prevent magnet from demagnetization are as follow:

  1. Do not heat magnet or keep it near the hot object.
  2. Do not drop the magnet.
  3. Do not hit or rub magnet.
  4. Do not let magnet rust.
  5. Do not keep similar poles of magnet closer to each other.

Magnetic induction is the process by which substances like iron are magnetized by magnetic field. The magnet causes the individual particles of the iron, which act like tiny magnets, to line up so that the sample as a whole becomes magnetized. Most of this induced magnetism is lost when the cause of magnetism it is taken away.