SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following methods could be used to demagnetise a permanent magnet?
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Cool it to a very low temperature.
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Put it in a coil of wire and pass current through the wire.
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Stroke it in a single direction with a permanent magnet.
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Heat it to a high temperature.
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Explanation:
Detailed explanation-1: -The magnetic properties of a magnet can be destroyed by, also called demagnetization: Heating magnet to very high temperature. Dropping the magnet frequently. Hammering the magnet repeatedly.
Detailed explanation-2: -At around 80 °C, a magnet will lose its magnetic force and it will become demagnetized permanently if exposed to this temperature for a period, or if heated above its Curie temperature. Heat the magnet even more, and it will melt, and eventually vaporize.
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