Q. Electromagnets are made of soft iron because soft iron has
A) High retentivity and low coercive force
B) Low retentivity and high coercive force
C) High retentivity and high coercive force
D) Low retentivity and low coercive force
Explanation
[Solution from source] An electromagnet must lose its magnetism as soon as the current is switched off, so it needs low retentivity, and it must be easy to demagnetise, so low coercivity. High retentivity and high coercivity suit permanent magnets. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.