With regard to ferromagnetic materials, which of the following statement is true?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Hard ferromagnetic materials are used in permanent magnets because they have large hysteresis area
The ferromagnetic material which retain magnetisation for a long period of time are called hard magnetic material or hard ferromagnets.
They are used for permanent magnets as they have large hysteresis area which gives high retentivity and high coercivity which is ideal for permanent magnet material.