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 :

Options

A. A for electric generators and transformers
B. A for electromagnets and B for electric generators
C. A for transformers and B for electric generators
D. B for electromagnets and transformers

Answer

D

Explanation

In cases of generator, transformer & electromagnets we need to use materials which can be quickly magnetized & demagnetized without much loss of energy and we know.
Loss of energy/cycle `prop` area of B-H curve .