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JEE Main · 2006 · 30 Apr 2006 · Offline · Chapter_pending

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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 cold junction✓ Correct
  2. (B)flow from Antimony to Bismuth at the hot junction
  3. (C)flow from Bismuth to Antimony at the cold junction
  4. (D)not flow through the thermocouple

Answer: (A)

Solution

In an antimony-bismuth thermocouple the thermo-emf drives conventional current from antimony to bismuth across the cold junction (the handy mnemonic is 'Antimony to Bismuth at the Cold junction'). So the current flows from antimony to bismuth at the cold junction.

JEE Main · 2006 · 30 Apr 2006 · Offline · Single correct option

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