Which of the following ways will cause the magnet to lose its magnetic properties?
A
Touching it to an iron piece
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B
Covering it with a layer of oil
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C
Heating it for a long time
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D
Touching it to a wood piece
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Solution
The correct option is C Heating it for a long time Heating a magnet results in decreasing the magnetic properties for a material. If we heat any material for a long time it may lose all its magnetic properties and act like a non-magnetic material.