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Question
The permanent magnet is made from which one of the following substances?
The permanent magnet is made from which one of the following substances?
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Solution
The correct option is C Ferromagnetic
ANSWER:
Explanation :
Materials having high susceptibility , high permeability , high retentivity and high coercivity are suitable for making permanent magnets ,
High susceptibility ensures strong magnetisation of the material and high permeability ensures that magnetic field can pass through the material strongly.
High retentivity ensures that the material retains its magnetic property strongly even in absence of external magnetising field and high coercivity ensures that the material doesn’t get demagnetised in presence of opposite external field .
Ferromagnetic substances possess the above properties.
Therefore, ferromagnetic substances are used for making permanent magnets.
Hence, the correct option is (C)
ANSWER:
Explanation :
Materials having high susceptibility , high permeability , high retentivity and high coercivity are suitable for making permanent magnets ,
High susceptibility ensures strong magnetisation of the material and high permeability ensures that magnetic field can pass through the material strongly.
High retentivity ensures that the material retains its magnetic property strongly even in absence of external magnetising field and high coercivity ensures that the material doesn’t get demagnetised in presence of opposite external field .
Ferromagnetic substances possess the above properties.
Therefore, ferromagnetic substances are used for making permanent magnets.
Hence, the correct option is (C)
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