The thermo e.m.f. of a thermo-couple is 25 μ V / ∘ C at room temperature. A galvanometer of 40 ohm resistance, capable of detecting current as low as 1 0 − 5 A , is connected with the thermo couple. T

Question

The thermo e.m.f. of a thermo-couple is $25 μ V /^{\circ} C$ at room temperature. A galvanometer of 40 ohm resistance, capable of detecting current as low as $1 0^{- 5} A$ , is connected with the thermo couple. The smallest temperature difference that can be detected by this sytem is

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Answer:

A

Solution:

$Δ T = \frac{40}{25 \times 1 0 ^{- 6} \times 1 0 ^{- 5}} \Rightarrow Δ T = 1 6^{0} C$

TestHub · Accepted Answer

Δ T = 25 × 1 0 − 6 × 1 0 − 5 40 ​ ⇒ Δ T = 1 6 0 C

Physics - Current Electricity Question with Solution | TestHub

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