A thermocouple of negligible resistance produces an emf of 40 μ V / ∘ C in the linear range of temperature. A galvanometer of resistance 10Ω whose sensitivity is 1 μ A / div, is employed with the term

Question

A thermocouple of negligible resistance produces an emf of 40 μ V / ∘ C in the linear range of temperature. A galvanometer of resistance 10Ω whose sensitivity is 1 μ A / div, is employed with the termocouple. The smallest value of temperature difference that can be detected by the system will beNEET 2011 (Mains)

TestHub · Accepted Answer

For minimum deflection of 1 division require current = 1 μ A voltage required = i R = 1 × 10 = 10 μ V ∴ 40 μ V 10 μ V ​ ≅ 1 ∘ C ≅ 4 1 ​ ∘ C = 0.2 5 ∘ C ​

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