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A thermocouple of negligible resistance produces an e.m.f. of 40 µV/⁰C in the linear range of temperature. A galvanometer of resistance 10 ohm whose sensitivity is 1 µA/div, is employed with the thermocouple. The smallest value of temperature difference that can be detected by the system will be
Options
(a) 0.5⁰C
(b) 1⁰C
(c) 0.1⁰C
(d) 0.25⁰C
Correct Answer:
0.25⁰C
Explanation:
I division = 1µA
Current for 1⁰C = 40µV / 10 = 4µA
1µA = 1/4 ⁰C = 0.25⁰C
Related Questions: - A potentiometer wire is 100cm long and a constant potential difference is maintained
- During an adiabatic process, the cube of the pressure is found to be inversely
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Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A potentiometer wire is 100cm long and a constant potential difference is maintained
- During an adiabatic process, the cube of the pressure is found to be inversely
- A point charge q is situated at a distance r on axis from one end of a thin
- If Q, E and W denote respectively the heat added, change in internal energy
- The speed of light in media M₁ and M₂ are 1.5×10⁸ ms⁻¹ and 2×10⁸ ms⁻¹ respectively.
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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