Harish was asked to identify a soft iron placed in a basket with 9 other magnets of the same shape and size. Which is the easiest way of identifying the iron piece at the earliest?

By suspending the magnets one at a time.

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By conducting repulsion test using any two magnets at a time.

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By heating all the magnets together.

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By dropping all the magnets into the water.

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Solution

The correct option is B By conducting repulsion test using any two magnets at a time.

All the magnets in the basket when suspended, will align in north-south direction. This will not help in identifying the soft iron.

Repulsion is the surest test for magnetism. It is the surest test because any substance made of iron, nickel, cobalt will also have an attraction but won't have repulsion. Harish can conduct the repulsion test by taking two magnets.

Heating will demagnetize all the magnets wihich will not help in this case.

Dropping all the magnets in water will make no change in the magnetic properties.

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Similar questions

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)

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. Dev was asked to identify a soft iron placed in a basket with 9 other magnets of the same shape and size. Which is the easiest way of identifying the iron piece at the earliest?

Q. Harish was asked to identify a piece of soft iron put in a basket of 10 magnets of the same shape and size. Which is the easiest way to identify the iron piece at the earliest?

Harish was asked to identify a piece of soft iron put in a basket of 10 magnets of the same shape and size. Which is the easiest way of identifying the iron piece at the earliest?

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