As shown in the figure a staring bar magnet A is brought near to a piece of soft iron B. Indicate the magnetic poles induced on B

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Solution

When a bar magnet is brought near a soft iron, soft iron becomes a magnet in the presence of a bar magnet
This phenomenon is known as magnetic induction
So magnetic induction is the phenomenon of acquiring magnetism by a magnetic material in the presence of a permanent magnet
When the north pole of the magnet is brought near the soft iron core, an opposite pole i.e south pole is acquired at that end.
The magnetic poles acquired by the soft iron is the south pole near the end facing north pole of the magnet

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Q. Fill in the blanks with the appropriate word.
(a) If a bar magnet is hung by a thread tied at its centre, its north pole becomes steady in the direction of the ................ Pole of the earth.
(South, north, east, west)
(b) If a bar magnet is cut into equal pieces by cutting it at right angles to its axis at two places, ........... bar magnets are formed, and a total of ................ poles are formed.
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(d) When magnetic material is taken close to a magnet, the material acquires ............... .
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(e) If a magnet attracts a piece of metal, that piece must be made of ............. .
(any other metal but iron, magnetic material or iron, non-magnetic material)
(f) A magnet remains steady in a .............. direction.
(east-west, north-south)

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