Q6
General SciencePhysics
Which of the following is the most suitable material for making permanent magnet?
- a.Steel
- b.Soft iron
- c.Copper
- d.Nickel
Answer: (A) Steel
Steel has high retentivity and high coercivity, so once magnetised it keeps its magnetism, which is what a permanent magnet needs. Soft iron loses its magnetism easily and is used for electromagnets, copper is not ferromagnetic, and nickel is only weakly suited compared with steel.