Verified Solution • 2025–26 Session moderate

QPages 217-218: Q6: HC Verma: Concepts of Physics - Volume 2 Thermal and Chemical Effects of Electric Current Pages 217-218: Q6 Solution: Consider the following statements. A) Free-electron density is…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often think that raising the temperature changes the number of conduction electrons, but in a metal the free‑electron density is fixed by the valence electrons and is essentially temperature‑independent. The Peltier effect depends on the difference in electron density between the two metals, not on temperature‑induced changes in that density.

Consider the following statements. A) Free-electron density is different in different metals. B) Free-electron density in a metal depends on temperature. Peltier 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:** Peltier effect is caused by both factors.

All Questions in this Chapter

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