Electromagnets are made up of soft iron because soft iron has:
Correct answer: C. Low retentivity and low coercive force
- A. Low retentivity and high coercive force
- B. High retentivity and high coercive force
- C. Low retentivity and low coercive force
- D. High retentivity and low coercive force
Explanation
Electromagnets need to be switched on and off easily. Softiron is ideal because it has low retentivity (it doesn't staymagnetized) and low coercivity (it's easy to magnetize anddemagnetize), allowing for rapid control of the magnetic field.
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About Physics of Solids
Solids are compared through crystal structure, amorphous arrangement, elasticity, plastic deformation, stress, strain and Young’s modulus. Electrical behavior depends on available charge carriers and band structure, so conductors, insulators and semiconductors must be distinguished from mechanical properties such as strength, stiffness and brittleness.
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