Question

Which of the following statements is not true?
(a) Paramagnetic substances are weakly attracted by magnetic field.
(b) Ferromagnetic substances cannot be magnetised permanently.
(c) The domains in antiferromagnetic substances are oppositely oriented with respect to each other.
(d) Pairing of electrons cancels their magnetic moment in the diamagnetic substances.

Answer 1

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$\text{\underline{The\:correct\:option\:is:}}$ B)


Ferromagnetic substances cannot be magnetised permanently.


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Answer 2

(B) Ferromagnetic substances cannot be magnetised permanently

Because

The main way that permanent magnets are created is by heating a ferromagnetic material to a key high temperature. The temperature is specific to each kind of metal but it has the effect of aligning and “fixing” the domains of the magnet in a permanent position. It is conjectured that this same process inside the Earth is what creates natural permanent magnets.