Question: Q. 2. What are permanent magnets ? Give one example.
R [Delhi Comptt. I, II, III 2013, Delhi I, II, III 2013]
Solution:
Ans. Substances, which at room temperature, retain their ferromagnetic property for a long period of time are called permanent magnets. e.g. Iron, cobalt, steel and nickel.
[CBSE Marking Scheme 2013]
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