Verified Solution • 2025–26 Session moderate

QPages 217-218: Q7: HC Verma: Concepts of Physics - Volume 2 Thermal and Chemical Effects of Electric Current Pages 217-218: Q7 Solution: Consider the following statements. A) Free-electron density is…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often assume the free‑electron density in a metal is temperature‑independent, selecting only statement A. In reality, thermal expansion and the shift of the Fermi level cause the electron density to vary with temperature, so both A and B contribute to the Thomson effect.

Consider the following statements. A) Free-electron density is different in different metals. B) Free-electron density in a metal depends on temperature. Thomson Effect is caused ____________.

Multiple Choice Options

  • A due to both A and B
  • B due to A but not due to B
  • C due to B but not due to A
  • D neither due to A nor due to B

Step-by-Step Verified Solution

**Answer:** (a) due to both A and B. **Step-by-Step Explanation:** Thomson effect is caused by both factors.

All Questions in this Chapter

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