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The thermo-emf of a thermocouple is  at room temperature.  A galvanometer of   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)



Question ID - 150522 | SaraNextGen Top Answer

The thermo-emf of a thermocouple is  at room temperature.  A galvanometer of   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)

1 Answer
127 votes
Answer Key / Explanation : (a) -

(a)

Thermo-emf of thermocouple

Let  be the smallest temperature difference.

Therefore, after connecting the thermocouple with the galvanometer, thermo-emf

Potential drop developed across the galvanometer

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