Concepts Of Physics MCQ Edition [Volume 2]PhysicsMagnetic Properties of Matter
Soft iron is utilized for making electromagnets since it possesses
Options
- Alow retentivity and high coercive force
- Blow retentivity and low coercive force
- Chigh retentivity and high coercive force
- Dhigh retentivity and low coercive force
Correct answer
B. low retentivity and low coercive force
Step-by-step solution
Electromagnets are temporary magnets that need to be strongly magnetized when current flows through the coil and completely demagnetized when the current is switched off. To ensure that the magnetism effectively drops to zero when the current is removed, the core material must have low retentivity. Additionally, the material should be easily magnetized and demagnetized with minimal energy loss (low hysteresis loss), which requires a low coercive force. Soft iron is utilized for making electromagnets because it poss