Magnetic force required to demagnetize the material

retainity

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coercivity

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energy loss

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hysteresis

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Solution

The correct option is B coercivity
For a ferromagnetic substance, coercivity is the intensity of the magnetic field that need to be applied to reduce the magnetization to zero when the sample's magnetization reaches saturation.
It is 'Intensity of the magnetic field' rather than 'Magnetic force'.

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