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QPages 285-286: Q7: HC Verma: Concepts of Physics - Volume 2 Magnetic Properties of Matter Pages 285-286: Q7 Solution: Electromagnets are made of soft iron because soft iron has…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often confuse the properties of soft magnetic materials (used in electromagnets) with hard magnetic materials (used in permanent magnets), incorrectly assuming that high retentivity is necessary for strong magnetization. Remember that soft iron requires low retentivity and low coercive force to allow the magnetic field to vanish immediately when the current is switched off.

Electromagnets are made of soft iron because soft iron has _______________.

Multiple Choice Options

  • A high retentivity and high coercive force
  • B high retentivity and low coercive force
  • C low retentivity and high coercive force
  • D low retentivity and low coercive force

Step-by-Step Verified Solution

**Answer:** (d) low retentivity and low coercive force. **Step-by-Step Explanation:** Electromagnets need soft iron with low retentivity and low coercive force so they can be easily magnetised and demagnetised.

All Questions in this Chapter

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