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Materials suitable for permanent magnets must have which of the following properties?
- AHigh retentivity, low coercivity and high permeability.
- BLow retentivity, low coercivity and low permeability.
- CLow retentivity, high coercivity and low permeability.
- DHigh retentivity, high coercivity and high permeability.
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The permanent magnet is made from which one of the following substances?
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View SolutionMagnetic susceptibility of $Mg$ at $300 \ K$ is $1.2 \times 10^{-5}$. What is its susceptibility at $200 \ K$?
Which of the following is most suitable for the core of electromagnets?
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The curve representing the relationship between the magnetic moment $(M)$ and the temperature $(T)$ of a ferromagnetic material is:
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