A substance that has low retentiveness can be used for manufacturing of ________

CONCEPT:

Materials with low retentiveness lose magnetic flux density once the external magnetizing force is removed hence are useful in creating electromagnets.

• An electromagnet is a temporary magnet that should ideally have the property to behave as a magnet when current passes through it and lose magnetism as soon as current is stopped.
• Soft iron is generally used for making electromagnets because it has high magnetic permeability, i.e. it can easily gain magnetic properties when current is passed around the core and quickly lose when current is stopped.
• The soft iron inside the coil makes the magnetic field stronger because it becomes a magnet itself when the current is flowing

EXPLANATION:

• As the electromagnet is a temporary magnetic which is only working till when we give the current to it.
• Once the electric current is stopped the magnetic property of the electromagnet vanished.
• But there is a very small time duration, in which the magnetic property of the electromagnet exists after stopping the electric current in it. This is due to electromagnetic induction in the coil of the electromagnet.