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Which one of the following is the example of an artificial magnet?

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Iron Ore

Cobalt

Nickel

Horseshoe

answer is D.

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Detailed Solution

Ball-ended magnet is an example of an artificial magnet.
All other examples of the above options are found naturally on earth. Magnets have two types: natural magnets and artificial magnets. Natural magnets occur in nature, and they are permanent and will never lose their magnetic power. Also, they are found in different places and in different shapes. An example of a natural magnet is magnetite. Humans make artificial magnets, and they are made extra strong. Artificial magnets have two types of magnets: temporary and permanent examples of artificial magnets are horse-shoe magnets and bar magnets.

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