The thermo e.m.f. of a thermo-couple is 
at room temperature. A galvanometer of 40 ohm resistance, capable of detecting current as low as 
is connected with the thermocouple. The smallest temperature difference that can be detected by this system is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Thermo-emf of thermocouple is 
∴ After connecting the thermocouple with the galvanometer, thermo-emf
Potential drop developed across the galvanometer
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