Acid used for making permanent markings on the glass surface is.

The alloy used for making permanent magnet is

The substance used for making permanent magnet is

Alnico is used for making permanent magnets becoause it has

Fill in the blanks The material used for making permanent magnetis are _______.

Why should the material used for making permanent magnet have high coercivity?

Why is pure ironnot used for making permanent magnets? Name one material used for making permanent magnets. State two example of electrical instruments made by using permanent magnets.

Why should the materials used for making permanent magnets have high coercivity ?