A magnet attracts objects made up of

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Iron

Nickel

Cobalt

All of these

answer is D.

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Detailed Solution

A magnet attracts objects made of iron, nickel and cobalt.
There are two types of materials on the basis of magnetic properties they possess. Magnetic and non-magnetic materials. Magnetic materials are those materials which are attracted to the magnets, and non-magnetic materials are those materials which are neither attracted nor repelled by the magnets.
Iron, nickel and cobalt are magnetic materials. Hence, the magnets will attract objects made up of these materials.

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