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QPage 218: Q2: HC Verma: Concepts of Physics - Volume 2 Thermal and Chemical Effects of Electric Current Page 218: Q2 Solution: A copper strip AB and an iron strip AC are joined at A. The…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often assume a temperature gradient along a uniform metal (copper or iron) creates a measurable voltage between its own ends; however, the Seebeck effect produces a net emf only when two dissimilar conductors form a loop, so the observable potential difference appears between the free ends B and C, not within a single strip.

A copper strip AB and an iron strip AC are joined at A. The junction A is maintained at 0�C and the free ends B and C are maintained at 100�C. There is a potential difference between ____________.

Multiple Choice Options

  • A the two ends of the copper strip
  • B the copper end and the iron end at the junction
  • C the two ends of the iron strip
  • D the free ends B and C

Step-by-Step Verified Solution

**Answer:** (d) the free ends B and C. **Step-by-Step Explanation:** There is a potential difference between the free ends B and C due to the Seebeck effect at the junctions.

All Questions in this Chapter

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