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Current Electricity question

2011 · Q80
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Current Electricity question

2011 · Q80

NEETPhysicsCurrent ElectricityMCQ+4 / −1
A thermocouple of negligible resistance produces an e.m.f. of 40 µV/ºC in the linear range of temperature. A galvanometer of resistance 10 ohm whose sensitivity is 1 µA/division, is employed with the thermocouple. The smallest value of temperature difference that can be detected by the system will be
  1. A
    1ºC
  2. B
    0.5 ºC
  3. C
    0.1ºC
  4. D
    0.25ºC
View written solutionFree

Correct answer: D

For minimum deflection of 1 division required current = 1 µA

⇒\Rightarrow⇒ Voltage required = IR = (1µA) (10) = 10 µV

∴\therefore∴ 40 µV ≡ 1ºC

⇒\Rightarrow⇒ 10 µV ≡ 14{1 \over 4}41​ ºC = 0.25ºC

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