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A thermocouple of negligible resistance ...

A thermocouple of negligible resistance produces an emf of 40 µV/°C in the linear range of temperature. A galvanometer of resistance 10 ohm whose sensitivity is 1µA/div is employed with the thermocouple. The smallest value of temperature difference that can be detected by the system will be (a) 0.5°C (b) 1°C (c) 0.1°C (d) 0.25°C

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