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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: - In an inductor when current changes from 2 A to 18 A in 0.05 sec, the e.m.f. induced
- A capacitor of capacitance 100μF is charged by connecting it to a battery of voltage
- A force of 5 N is acting on an object. Displacement of object is 10 m and the work done
- Energy stored in the coil of a self inductance 40 mH carrying a steady current of 2A
- An electric motor operating on a 60 volt D.C supply draws a current of 10 amp.
Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- In an inductor when current changes from 2 A to 18 A in 0.05 sec, the e.m.f. induced
- A capacitor of capacitance 100μF is charged by connecting it to a battery of voltage
- A force of 5 N is acting on an object. Displacement of object is 10 m and the work done
- Energy stored in the coil of a self inductance 40 mH carrying a steady current of 2A
- An electric motor operating on a 60 volt D.C supply draws a current of 10 amp.
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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