The value of magnetizing force at which residual flux density becomes zero is called
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This is called as RETENTIVITY and indicates the remnance or level of residual magnetism in the material. As the magnetic field is reversed, the curve moves to point 'c', where the magnetization reaches to zero. This point is called as COERCIVITY or coercive force.
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If the magnetising force is reduced to zero, the curve AC is obtained. OC is called the remanance or residual flux density, that is, the flux density remaining after the magnetising force has been reduced to zero. The magnetising force must be reversed and increased to OD in order to reduce the remanance to zero. OD is called the coercive force.
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