which of these are not the property of electromagnets:-
i) an increase in current increases its strength.
ii) they are permanent magnets.
iii) they remain magnetized even after the current is switched off.
iv) they are of varying shape and size.
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Answer:
ii
Explanation:
(i) An electromagnet is temporary in nature. (ii) An electromagnet is made of a soft iron core. (iii) The magnetic field strength can be changed. (iv) An electromagnet can be easily demagnetized by switching off the current.
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Explanation:
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