Physics - Magnetism Question with Solution | TestHub

For making an electromagnet, the core material should acquire strong magnetization when the current is switched on and should lose its magnetization almost completely when the current is switched off.

This requires the material to have high permeability (to get strongly magnetized), low retentivity (to lose magnetism quickly when the current is removed), and low coercivity.

Soft iron is used in making electromagnets because it possesses high permeability, low retentivity, and low coercivity. Among the given options, low retentivity is the correct reason.

Answer: It has low retentivity