Answer to Question #93181 in Electricity and Magnetism for Penstat

Question

1 Give an example of magnetic induction.
2. What are the features that distinguish magnetic induction from other processes of magnetization

Answer 1

1) Imagine you have two non-magnetized small balls of steel, like balls from ball-bearing. If you approach a strong neodymium magnet to these pieces, of course the steel will attract to the magnet. After you remove the magnet, if you separate the balls to a distance of about 5 mm, and leave them alone, they will attract to each other. This will occur because the balls will be magnetized.

2) Magnetic induction occurs by means of external magnetic field. Thermal residual magnetization occurs when rocks with ferromagnetic components cool down below the Curie point or Neel temperature. Chemical residual magnetization occurs in sedimentary rocks when by means of chemical reactions iron oxides are formed.