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- Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R Assertion A : Electromagnets are made
- #Class 12
- #Engineering
- #Physics
- #Magnetic Effects of Current and Magnetism
- #Joint Entrance Examination Main
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R
Assertion A : Electromagnets are made of soft iron.
Reason R : Soft iron has high permeability and low retentivity. In the light of above, statements, chose the most appropriate answer from the options given below
A is correct but R is not correct
Both A and R are correct and R is the correct explanation of A
Both A and R are correct but R is NOT the correct explanation of A
A is not correct but R is correct
Answers (1)
Since electromagnetic materials acquire magnetic properties quickly, they have to be highly susceptible to magnetism.
Also, as soon as the current flow ceases, the material stops behaving as an electromagnet. This indicates that the material has a low capacity to retain the magnetic properties and hence, it must have low retentivity.
Soft iron is known to have low retentivity and high susceptibility to magnetism. Therefore electromagnets are made using soft iron.
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