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Saturation is an effect by which any increase in mangetising force produces a feable improvement in magnetic property if the magnetising force is increased beyond a certain limit. This is analogous to the stress-strain curve of a material obeying Hooke's law.

Saturation is of serious concern in electrical engineering that when a Current transformer with a certain ampere rating is fed from a high current source at primary(than it can carry) , the unit can respond at secondary upto the max. magnetic flux carrying capacity of the core and if at such a condition, the secondary if kept open, can produce an unopposed m.m.f which would consequently produce heating of the core and in some cases to the exploding of the CT unit.

The classical equation that relates magnetism with electricity is H x l= NI which can be used for theoretical calculation of mangetic field intensity with a given ampere turn.

However, saturation for an artificial permanent magnet is the max. value of H upto which is can be magnetised, in spite of being exposed to a strong magnetic field for a specific duration.

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