Current Electricity - Result Question 44

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

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======= ####46. A thermocouple of negligible resistance produces an e.m.f. of 40μV/C in the linear range of temperature. A galvanometer of resistance 10 ohm whose sensitivity is 1μA/ div, is employed with the termocouple. The smallest value of temperature difference that can be detected by the system will be

c3eec34ec6b1fad69db54a20ad4b2dca40c2aa54 (a) 0.5C

(b) 1C

(c) 0.1C

(d) 0.25C

[2011M]

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Answer:

Correct Answer: 46. (d)

Solution:

  1. (d) 1 division =1μA

Current for 1C=40μV10=4μA

1μA=14C=0.25C.



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