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

flow from Antimony to Bismuth at the cold junction

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flow from Antimony to Bismuth at the hot junction

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flow from Bismuth to Antimony at the cold junction

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not flow through the thermocouple

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Solution

The correct option is A flow from Antimony to Bismuth at the cold junction
Bismuth comes before Antimony in the thermoelectric series. At the cold junction, current flows from metal that is later in thermoelectric series to the one that is earlier in the thermoelectric series. Hence at the cold end, current will flow from Antimony to Bismuth.

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