HC Verma: Concepts of Physics - Volume 2 Thermal and Chemical Effects of Electric Current Page 218: Q3 Solution: The constants a and b for the pair silver-lead are and ,…

QPage 218: Q3: HC Verma: Concepts of Physics - Volume 2 Thermal and Chemical Effects of Electric Current Page 218: Q3 Solution: The constants a and b for the pair silver-lead are and ,…

⚠️ Common Exam Traps & Conceptual Pitfalls

The neutral (or inversion) temperature is found from $T_n=-a/b$. If $a$ and $b$ have the same sign, $T_n$ is negative and therefore not a realizable temperature above the cold junction; students often overlook the leading minus sign and incorrectly assume a neutral point always exists.

The constants a and b for the pair silver-lead are

2.50 \ \mu\text{V}^\circ\text{C}^{-1}

and

0.012 \ \mu\text{V}^\circ\text{C}^{-2}

, respectively. For a silver-lead thermocouple with colder junction at 0�C, __________.

Multiple Choice Options

A there will be no neutral temperature
B there will be no inversion temperature
C there will not be any thermo-emf even if the junctions are kept at different temperatures
D there will be no current in the thermocouple even if the junctions are kept at different temperatures

Step-by-Step Verified Solution

**Answer:** (a) there will be no neutral temperature. **Step-by-Step Explanation:** For silver-lead, a = 2.50 _V/�C and b = 0.012 _V/�C_. Both positive, so __n = -a/b is negative, meaning no neutral temperature above 0�C.

QPage 218: Q3: HC Verma: Concepts of Physics - Volume 2 Thermal and Chemical Effects of Electric Current Page 218: Q3 Solution: The constants a and b for the pair silver-lead are and ,…

Multiple Choice Options

Step-by-Step Verified Solution

All Questions in this Chapter

Related Learning Resources & Exam Preparation