A thermocouple of negligible resistance produces an emf fo `40 mu V//^(@)C` in the linear range of temperature. A galvanometer of resistance `10 Omega` whose sensitivity is `1 mu A//div` is employed with the thermocouple. The smallest value of temperature difference that can be detected by the system willA. `0.5^(@)C`B. `1^(@)C`C. `0.1^(@)C`D. `0.25^(@)C`

A thermocouple of negligible resistance produces an emf fo `40 mu V//^

1.	A thermocouple of negligible resistance produces an emf fo `40 mu V//^(@)C` in the linear range of temperature. A galvanometer of resistance `10 Omega` whose sensitivity is `1 mu A//div` is employed with the thermocouple. The smallest value of temperature difference that can be detected by the system willA. `0.5^(@)C`B. `1^(@)C`C. `0.1^(@)C`D. `0.25^(@)C`
Answer» Correct Answer - D (d) For minimum deflection of 1 divison require current `= 1 mu A` Voltage required `= iR = 1 xx 10 = 10 mu V` `:. 40 mu V~= 1 ^(@)C` `10 mu V ~= (1)/(4)^(@)C` `= 2.50^(@)C`

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