For minimum deflection of 1 division require current =1μA voltage required =iR=1×10=10μV ∴40μV10μV≅1∘C≅41∘C=0.25∘C
NEET UG 2011 — Physics Electromagnetism
A thermocouple of negligible resistance produces an emf of 40μV/∘C in the linear range of temperature. A galvanometer of resistance 10Ω 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
Held on 30 Apr 2011 · Verified 9 Jul 2026.
0.5∘C
1∘C
0.1∘C
0.25∘C
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