Verified Solution • 2025–26 Session moderate

QPage 285: Q7: HC Verma: Concepts of Physics - Volume 2 Magnetic Properties of Matter Page 285: Q7 Solution: When a ferromagnetic material goes through a hysteresis loop,…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often think the heat generated in a hysteresis loop comes from the material itself or from the magnetic field alone, overlooking that the area of the loop represents work done by the external power supply. Remember: the increase in thermal energy is supplied by the external source that drives the changing magnetising field, not created spontaneously within the ferromagnet.

When a ferromagnetic material goes through a hysteresis loop, its thermal energy is increased. Where does this energy come from?

Step-by-Step Verified Solution

**Answer:** The energy comes from the external source that is driving the magnetising field (e.g., the battery or power supply). **Step-by-Step Explanation:** When a ferromagnetic material goes through a hysteresis loop, work is done by the external magnetising source to overcome the opposition to domain wall motion and domain rotation. This work is dissipated as heat (thermal energy) in the material due to internal friction. The energy is supplied by the electrical source that maintains the alternating magnetising field.

All Questions in this Chapter

QPage 285: Q1 QPage 285: Q2 QPage 285: Q3 QPage 285: Q4 QPage 285: Q5 QPage 285: Q6 QPage 285: Q7 QPage 285: Q8 QPage 285: Q9 QPage 286: Q1 QPage 286: Q2 QPage 286: Q3 QPage 286: Q4 QPage 286: Q5 QPage 286: Q6 QPages 285-286: Q1 QPages 285-286: Q2 QPages 285-286: Q3 QPages 285-286: Q4 QPages 285-286: Q5 QPages 285-286: Q6 QPages 285-286: Q7 QPages 286-287: Q1 QPages 286-287: Q2 QPages 286-287: Q3 QPages 286-287: Q4 QPages 286-287: Q5 QPages 286-287: Q6 QPages 286-287: Q7 QPages 286-287: Q8 QPages 286-287: Q9

Related Learning Resources & Exam Preparation

Chapter Practice Bank
Practice all topic-wise questions from Magnetic Properties of Matter
Reference Textbook Solutions
Explore complete chapter exercises for HC Verma: Concepts of Physics - Volume 2
Competitive PYQ Question Bank
Browse year-wise authentic previous years' questions with solutions
Authentic CBT Mock Tests
Simulate official exam environment with live timer and percentile scoring