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प्रश्न
Why is it necessary to make a physical contact between a thermocouple and the object for measuring its temperature?
लघु उत्तर
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उत्तर
Physical contact is necessary so that heat can flow between the object and the thermocouple until both reach the same temperature. Only then does the thermocouple produce an emf corresponding to the temperature of the object, allowing its temperature to be measured correctly.
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