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NEET-XII-Physics

33: Thermal and Chemical Effects of Electric Current

with Solutions - page 4
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  • #13
    The temperatures of the junctions of a bismuth-silver thermocouple are maintained at 0°C and 0.001°C. Find the thermo-emf (Seebeck emf) developed. For bismuth-silver, a = - 46 × 10-6 V°C-1 and b = -0.48 × 10-6 V°C-2.
    Ans : Given:
    Difference in temperature, θ = 0.001°C,
    a = - 46 × 10-6 V °C-1
    b = - 0.48 × 10-5 V °C-2.
    Emf, E = aθ + `` \frac{1}{2}``bθ2
    ⇒ E = (- 46 × 10-6) × (0.001) `` -\frac{1}{2}`` × (0.48 × 10-6 )× (0.001)2
    = - 46 × 10-9 - 0.24 × 10-12
    = - 46.0024 × 10-9
    = - 4.6 × 10-8 V
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