What are permanent magnets and electromagnets? Compare their important properties. How permanent magnets
are obtained?
Answers
Answer:
Permanent Magnets: The magnets prepared from ferromagnetic materials that retain their magnetic properties for a long time are called permanent magnets.
An efficient way to make a permanent magnet is to place a ferromagnetic rod in a solenoid and pass current. The magnetic field of the solenoid magnetizes the rod.
The materials used for permanent magnet must have the following characteristic properties:
(i) High retentivity so that magnet may cause a strong magnetic field.
(ii) High coercivity so that the magnetization is not wiped out by strong external fields, mechanical ill-treatment, and temperature changes. The loss due to hysteresis is immaterial because the magnet in this case is never put to cyclic changes.
Answer:
Permanent magnets generate their own persistent magnetic field.
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current.
Q. How permanent magnets are obtained?
Permanent magnets are made from "hard" ferromagnetic materials such as alnico and ferrite that are subjected to special processing in a strong magnetic field during manufacture to align their internal microcrystalline structure, making them very hard to demagnetize.
Explanation:
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