question_answer

Consider the following statements (i) For a permanent magnet the area of a hysteresis loop is allowed to be large. (ii) Coercivity of the material in permanent magnets should be small. Which of the following statements is/are true?

A)  (i) but not (ii)                   

B)  (ii) but not (i)   

C)         Both (i) and (ii)

D)         Neither (i) nor (ii)

Correct Answer: A

Solution :

A good permanent magnet should produce a high magnetic field with a low mass, and should be stable against the influences which would demagnetize it. The desirable properties of such magnets are typically stated in terms of the remanence and coercivity of the magnet materials.