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Current Electricity question

2006 · Shift 0 · Q117
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Current Electricity question

2006 · Shift 0 · Q117

JEE MainPhysicsCurrent ElectricityMCQ+4 / −1
A thermocouple is made from two metals, Antimony and Bismuth. If one junction of the couple is kept hot and the other is kept cold, then, an electric current will
  1. A
    flow from Antimony to Bismuth at the hot junction
  2. B
    flow from Bismuth to Antimony at the cold junction
  3. C
    now flow through the thermocouple
  4. D
    flow from Antimony to Bismuth at the cold junction
View written solutionFree

Correct answer: D

  1. Concept involved: Seebeck effect

    When two dissimilar metals form a closed circuit and their two junctions are kept at different temperatures, a thermoelectric emf is produced. This causes current to flow in the circuit.

  2. Direction rule for Antimony–Bismuth thermocouple

    For the pair Antimony (Sb) and Bismuth (Bi), the conventional current in the thermocouple is known to flow:

    • from Bismuth to Antimony at the hot junction,
    • therefore, through the external return path, it flows from Antimony to Bismuth at the cold junction.

  3. Check each option

    • A: flow from Antimony to Bismuth at the hot junction
      This is incorrect.

    • B: flow from Bismuth to Antimony at the cold junction
      This is incorrect.

    • C: no flow through the thermocouple
      This is incorrect, because a temperature difference produces thermoelectric current.

    • D: flow from Antimony to Bismuth at the cold junction
      This is correct.

  4. Final answer

    Hence, the correct option is D.

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