NEET 2011 Physics question
A thermocouple of negligible resistance produces an e.m.f. of in the linear range of temperature. A galvanometer of resistance whose sensitivity is , is employed with the thermocouple. The smallest value of temperature difference that can be detected by the system will be :
Answer: (4)
Solution
The smallest detectable current is one division, . A temperature difference of gives an e.m.f. of , so (the thermocouple having negligible resistance) the
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