Question

# 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 conducting repulsion test using any two magnets at a time.By suspending the magnets one at a time.By dropping all the magnets into the water.By heating all the magnets together.

Solution

## The correct option is A 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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