A ferromagnetic substance becomes a permanent magnet when it is placed in a magnetic field because ....

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A ferromagnetic substance becomes a permanent magnet when it is placed in a magnetic field because ....

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all the domains get oriented in the direction of magnetic field

domains are not affected by magnetic field

domains get oriented randomly

all the domains get oriented in the direction opposite to the direction of magnetic field

answer is A.

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Detailed Solution

A ferromagnetic substance is a substance in which the magnetic moments of the individual atoms are aligned and point in the same direction.
These substances are strongly magnetized when placed in an external magnetic field.
Hence, only hard ferromagnets can be used to make permanent magnets.