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Magnetisation

Explain: The ...

Question

Explain: The north end of a freely suspended magnetic needle gets attracted towards a pieces of soft iron placed a little distance away from the needle.

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Solution

The needle induces magnetism on the piece of soft iron when it is places at some distance from the needle. Consequently, the iron piece acts like a magnet, attracting the magnetic needle towards it.

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Explain the following :

(a) When two pins are hung by their heads from the same pole of a magnet, their pointed ends move apart.

(b) Several soft iron pins can cling, one below the other, from the pole of a magnet.

(c) The north end of a freely suspended magnetic needle gets attracted towards a piece of soft iron placed a little distance away from the needle.

Q. When a Magnetic needle is suspended freely, it always aligns itself in the direction of magnetic north and south pole of the earth, the north pole of the needle gets attracted towards the magnetic south pole of the earth and the south gets repelled equally away from it. So two equal and opposite forces acting on the needle should cancel each other which does not happen because the:

When the North pole of a bar magnet is brought near the north pole of a freely suspended magnetic needle, the needle will get ___.

When a South pole of a magnet is brought near the North pole of a freely suspended magnetic needle, they both will attract each other.

Q. A straight copper conductor is held parallel to the axis of a freely suspended magnetic needle such that the conductor is under the needle and the current is flowing from south to north. In which direction the north of magnetic needle will move?

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