Question

What will happen if hard iron is used to make electromagnet?

Answer 1

it was work like magnet it attract iron or other metal and you see a heating effect on it

Answer 2

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For an electromagnet, you need a core material with low remnance. That is, when you remove the magnetomotive force (current in the coil) the core will (mostly) demagnetise and let the load or armature go. Iron or silicon steel has this property.

Other steel alloys do not necessarily have this property. They have a high remnance which means they remain highly magnetised even wjen the mmf is removed. This is an undesirable property for an electromagnet.


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