Discussion
Assertion (A) : Due to two metal with different coefficient of expansion, when the junction is formed, the junction produces a voltage corresponding to temperature.
Reason (R) : The metals which are used for making thermocouples are non homogeneous.
Answer: B
The key marks both statements as true, but with the reason not explaining the assertion. A thermocouple is made by joining two dissimilar metals, and the junction produces a voltage that depends on the temperature, which is the thermoelectric effect, and that is the content of the assertion in the key. The reason says that the metals used are non homogeneous, meaning that they differ from each other, which is a necessary condition for a thermocouple but does not by itself explain how the voltage is produced. So the two statements are true, but the reason does not explain the assertion. I could not confirm the explanation of the mechanism given in the assertion about the coefficient of expansion, so the answer rests on the official key. The answer is that both are true and (R) is not the correct explanation of (A).
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