Question

The core of an electromagnet is made of soft iron because soft iron has ________.

• A. large density and large retentivity
• B. small density and large retentivity
• C. large susceptibility and small retentivity
• D. small susceptibility and small retentivity

Answer 1

The correct option is C large susceptibility and small retentivity

Electromagnets are the magnets which looses all its magnetism as soon as the current through it vanishes, so it must have negligible retentivity. Since soft iron has large susceptibility and small retentivity, so soft iron is used to make the core of electromagnet.