The thermo emf of a thermocouple is 25 V ^ C at room temperature. A galvanometer of 40 Ω…
Physics · NEET · NTA Exams — Current Electricity
The thermo emf of a thermocouple is \(25 \frac{\mu V}{{ }^{\circ} C}\) at room temperature. A galvanometer of 40 Ω, capable of detecting current as low as \(10^{-5} \mathrm{~A}\), is connected with the thermocouple. The smallest temperature difference that can be detected by this system is equal to
- \(20^{\circ} \mathrm{C}\)
- \(16^{\circ} \mathrm{C}\)
- \(12^{\circ} \mathrm{C}\)
- \(8^{\circ} \mathrm{C}\)
Answer
(D) 8^ C
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