Which among these is not true for magnets
A) When a bar magnet is cut into half, each half will have only one pole
B) A magnet can be obtained from the iron in which all the electrons are spinning in the same direction
C) Iron, Nickel, and Cobalt are the three elements of a magnet
D) The earth acts as a huge magnet

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Solution

The correct option is A) When a bar magnet is cut into half, each half will have only one pole.
The ends of the magnet are known as poles of a magnet. When a bar magnet is cut into half there are two smaller dipole magnets are formed. Magnets are made of small pockets that are known as domains. The magnetic moment of these domains are aligned in one direction. By cutting the magnet into half, the alignment of the magnetic moments remains unchanged.

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Three identical iron bars are kept on a table. Two out of three bars are magnets. In one of the magnet, the North-South poles are marked. How will you find out which of the other two bars is a magnet? Identify the poles of this magnet.

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.

State whether the following statements are ‘True’ or ‘False’.

(i) A cylindrical magnet has only one pole.

(ii) Artificial magnets were discovered in Greece.

(iii) Similar poles of a magnet repel each other.

(iv) Maximum iron filings stick in the middle of a bar magnet when it is bought near them.

(v) Bar magnets always point towards the North−South direction.

(vi) A compass can be used to find the East−West direction at any place.

(vii) Rubber is a magnetic material.

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)

A bar magnet has a magnetic moment of $0.4 A . m^{2}$ . On cutting it into two equal halves along equatorial line, each half will have a magnetic moment of :

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