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Poles of magnet

Demagnetisati...

Question

Demagnetisation of a permanent magnet occurs when its poles are left bare for a long time.

A

True

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B

False

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Solution

The correct option is A True
Magnets have north and south poles.
Due to improper storage of magnets, magnets can lose their magnetism.
So if both the similar poles are placed together, the magnet will lose its magnetism.
So unlike poles are placed nearby to maintain the polarity of the magnets.
Hence, the statement is true.

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Similar questions

Q. Fill in the blanks with the correct words.
1. Only ..................... (magnetic/non-magnetic) materials are attracted by magnets.
2. Like poles of two magnets ..................... (attract/repel) each other.
3. A magnet that retains its properties for a very long period of time is called ..................... (electro/permanent) magnet.
4. A horseshoe magnet should be stored with a piece of ..................... (plastic/iron) across its poles.
5. A ......................................... (credit card/magnetic compass) is a devicer used to find directions.

Q. Two long bare magnets are placed with their axes coinciding in such a way that the north pole of the first magnet is 2.0 cm from the south pole of the second. If both the magnets have a pole strength of 10 Am, find the force exerted by one magnet of the other.

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.
(6,3,2)
(c) There is repulsion between the .......... poles of a magnet, and attraction between its ............ poles.
(opposite, like.)
(d) When magnetic material is taken close to a magnet, the material acquires ............... .
(permanent magnetism, induced magnetism)
(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)

Q. Which of the following statements are correct? Rewrite the incorrect ones correctly.
(a) A magnet will be attracted to the aluminium frame of a window.
(b) A magnet will not lose its magnetism even if it is repeatedly dropped on the floor.
(c) When a magnet is dipped into a box of paper clips, most of them will be seen sticking to the ends of the magnet.
(d) A magnet need not always have two poles.
(e) Magnetic poles that are alike attract each other.
(f) If a magnet is floated on a cork in water and balanced, one end will point east and the other end will point west.
(g) Both the ends of a solid bar are attracted to both poles of a magnet. The bar could be a magnet.
(h) Unlike magnetic poles attract each other.
(i) Iron can be used to make permanent magnets.
(j) Compasses work best when they are placed near iron objects.

Q. A permanent magnet can be demagnetized by.

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