Hysteresis loops for two magnetic materials

Question:

Hysteresis loops for two magnetic materials $\mathrm{A}$ and $\mathrm{B}$ are given below :

These materials are used to make magnets for electric generators, transformer core and electromagnet core. Then it is proper to use

  1. B for electromagnets and transformers.

  2. A for electric generators and transformers.

  3.  A for electromagnets and B for electric transformers.

  4.  A for transformers and $B$ for electric generators.


Correct Option: 1

Solution:

For electromagnet and transformers, we require the core that can be magnitised and demagnetised quickly when subjected to alternating current. From the given graphs, graph B is suitable.

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