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?

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 bringing another strong magnet near the basket

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By dropping all 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

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. In this way, he has to conduct the test for a maximum of five times.

Dropping a magnet in water will have no effect. By bringing a strong magnet toward the basket, the magnet may get attracted towards the strong magnet depending on the orientation of the pole. By suspending all the substances, the magnet may be identified as it will align in the N-S direction. But it will be a time-taking as well as an inaccurate process.

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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)

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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