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QPage 285: Q8: HC Verma: Concepts of Physics - Volume 2 Magnetic Properties of Matter Page 285: Q8 Solution: What are the advantages of using soft iron as a core, instead…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often pick steel for its mechanical robustness, forgetting that a galvanometer core must have low coercivity and a narrow hysteresis loop; using steel leaves residual magnetisation and reduces sensitivity, whereas soft iron’s high permeability and easy demagnetisation are essential.

What are the advantages of using soft iron as a core, instead of steel, in the coils of galvanometers?

Step-by-Step Verified Solution

**Answer:** Soft iron has high permeability and low coercivity, which makes it ideal for use as a core in galvanometers. **Step-by-Step Explanation:** A galvanometer core should be easily magnetised and demagnetised by small currents, and it should not retain magnetism when the current is removed. Soft iron has a narrow hysteresis loop (low coercivity) and high permeability, so it responds quickly to changes in the magnetic field and loses its magnetisation when the field is removed. This ensures accurate and sensitive response to the current being measured.

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