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  • A thermocouple of negligible resistance produces an e.m.f. of in the linear range of temperature.

A thermocouple of negligible resistance produces an e.m.f. of 40\mu V^{o}/C in the linear range of temperature. A galvanometer of resistance 10 ohm whose sensitivity is 1\mu A/div, is employed with the termocouple. The smallest value of temperature difference that can be detected by the system will be

Option: 1

0.5^{o}C


Option: 2

1^{o}C


Option: 3

0.1^{o}C


Option: 4

0.25^{o}C


Answers (1)

best_answer

 

Ammeter -

It is a device used to measure current and always connected in series 

- wherein

For minimum deflection of 1 division require current is 1\mu A

Voltage required= iR=1\mu A\times10\Omega=10\mu V

40\mu V\rightarrow 1^oC\\10\mu V\rightarrow 0.25^0C

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