The smallest temperature difference measured with a thermocouple of e.m.f. 30 μ VC-1 and a galvanometer of 50 Ω and capable of measuring a minimum current of 3 × 10-7 is

Question

The smallest temperature difference measured with a thermocouple of e.m.f. 30 μ VC-1 and a galvanometer of 50 Ω and capable of measuring a minimum current of 3 × 10-7 is (A) 0.5 ° (B) 1° (C) 1.5° (D) 2°

Tardigrade Admin · Accepted Answer

Using V = 1R we get V = 3 × 10-7 × 50 Detectable temperature difference = (V/E) = (3 × 10-7 × 50/30 × 10-6) = 0.5°

Q. The smallest temperature difference measured with a thermocouple of e.m.f. $30 μ V C^{- 1}$ and a galvanometer of $50 Ω$ and capable of measuring a minimum current of $3 \times 1 0^{- 7}$ is

0.5 $^{\circ}$

1 $^{\circ}$

1.5 $^{\circ}$

2 $^{\circ}$

Using V = 1R we get V = $3 \times 1 0^{- 7} \times 50$
Detectable temperature difference = $\frac{V}{E} = \frac{3 \times 1 0 ^{- 7} \times 50}{30 \times 1 0 ^{- 6}} = 0. 5^{\circ}$

Q. The smallest temperature difference measured with a thermocouple of e.m.f. 30μVC−1 and a galvanometer of 50Ω and capable of measuring a minimum current of 3×10−7 is

0.5 ∘

1∘

1.5∘

2∘