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# Solve this problem 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

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

• Option 1)

flow from antimony to bismuth at the cold junction

• Option 2)

flow from antimony to bismuth at the hot junction

• Option 3)

flow from bismuth to antimony at the cold junction

• Option 4)

not flow through the thermocouple.

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As we learnt in

In series Grouping -

$R_{eq}=R_{1}+R_{2}+R_{3}+\cdot \cdot \cdot +R_{n}$

- wherein

$R_{eq}-$ Equivalent Resistance

At cold junction, current flow from Antimony to Bismuth (because current flows from metal occurring later in the series to metal occurring earlier in the thermoelectric series.

Option 1)

flow from antimony to bismuth at the cold junction

This option is correct.

Option 2)

flow from antimony to bismuth at the hot junction

This option is incorrect.

Option 3)

flow from bismuth to antimony at the cold junction

This option is incorrect.

Option 4)

not flow through the thermocouple.

This option is incorrect.

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