A substance that has low retentiveness can be used for the manufacture of ______.

The correct answer is option 2):(electromagnets)

Concept:

Electromagnets

•  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
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