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Difference between Electromagnet and Permanent Magnet

 


Basis for ComparisonElectromagnetPermanent Magnet
Generation of the magnetic fieldDue to electric currentDue to material characteristics when magnetized.
Strength of magnetic fieldThe strength of the field depends on the total current flowing through the solenoid or coil.Here the magnetic field strength solely relies on the respective material.
MagnetizationTemporaryPermanent
Type of material usedGenerally the soft iron coreUsually, it makes use of hard material.
DemagnetizationIt is demagnetized when the flow of current is stopped.The material is demagnetized when it is subjected to extremely high temperatures.
The requirement of external powerExistNot Exist
Magnetic field retentionThe field is retained till the time current flows through the materialThese materials retain the field all the time.
CostLowComparatively high
Poles of the magnetCan be varied.Here the poles can never be changed.
ExampleA solenoid across an ironBar Magnet
ApplicationsElectric bells, loudspeakers, motors, etc.Cell phones, headphones, sensors, etc.



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