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A thermocouple of negligible resistance produces an emf of 40 μV/°C in the linear range of temperature. A galvanometer of resistance 10 Ω whose sensitivity is 1 μA/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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