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Q.

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

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a

domains get randomly oriented.

b

all the domains get aligned opposite to the direction of magnetic field.

c

all the domains get aligned in the direction of magnetic field.

d

some of the domains get aligned either in same direction or in opposite direction.

answer is C.

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Detailed Solution

A ferromagnetic substance that has been exposed to a magnetic field transforms into a permanent magnet because the entire domain becomes orientated in the direction of the magnetic field even after the applied magnetic field has been removed.

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