EARTH SCIENCE
MAGNETISM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which is not a property of a magnet?
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all magnets have two poles
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all magnets have a force of attraction or repulsion
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all magnets are surrounded by a magnetic field
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all magnets can be turned off
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Explanation:
Detailed explanation-1: -They are always on. You can’t “switch off” permanent magnets without destroying their magnetic properties, but there is a way you can make them act as though they are switched on and off. To achieve that, an on/off switch or lever needs to be added.
Detailed explanation-2: -Electromagnets are used to power doorbells, construction cranes, and speakers. Magnets called permanent magnets cannot be turned off. These magnets do not need electricity to work.
Detailed explanation-3: -The combined magnetic force of the magnetized wire coil and iron bar makes an electromagnet very strong. Electromagnets can be turned on or off and their strength can be changed by controlling the electric current.
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