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Question:

Hysteresis loops for two magnetic materials A and B are given below: These materials are used to make magnets for electric generators, transformer core and electromagnet core. Then it is proper to use:

A for electromagnets and B for electric generators

B for electromagnets and transformers

A for electric generators and transformers

A for transformer and B for electric generators

Solution:

Hysteresis loop with more area signifies a 'hard' ferromagnetic material and hysteresis loop with less area signifies a 'soft' ferromagnetic material. Hence, A is good for electromagnets and B is good for electric generators.