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Question
Which of the following constituents of steels is softest and least strong?
Options:
A .  Austenite
B .  Pearlite
C .  Ferrite
D .  Cementite
Answer: Option C
Ferrites that are used in transformer or electromagnetic cores contain nickel, zinc, and/or manganese compounds.
They have a low coercivity and are called soft ferrites.

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