Among these which property is not belong to electromagnet?
(i) It is permanent magnet
(ii) Its magnetic strength can not be decreased or increased at as well
(iii) Its polarity can be remove by reversing flow of electric current.
(iv) It produce strong magnetic field.
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Answer:
i . it is a permanent magnet
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The property that does not belong to electromagnets is the fact that it is not a permanent magnet.
Electromagnets are man-made magnets that are made by wrapping a core of iron in electrically conducting wires. As a result of the current passing through the wires, a flux is produced inside the core. This flux forces the core to behave as a temporary magnet. It is effective only as long as the current is active. Also, the intensity and strength can be varied by changing the number of turns and the current.
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