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10th Class Science Electricity and Circuits Question Bank Electricity

  • question_answer
    The junctions of Ni-Cu thermocouple maintained at \[0{}^\circ C\] and \[100{}^\circ C\]. The Seebeck developed in the thermocouple will be  (given \[{{a}_{Ni-cu}}=16.3\times {{10}^{-6}}V{{/}^{\circ }}C\] and \[{{b}_{Ni-cu}}=-0.042\,V/{{C}^{2}}\]

    A) \[\text{1}.\text{42 }\times \text{ 1}{{0}^{\text{3}}}\text{ V}\]                   

    B) \[\text{1}.\text{42 }\times \text{ 1}{{0}^{-\text{3}}}\text{ V}\]    

    C) \[\text{14}.\text{2 }\times \text{ 1}{{0}^{\text{3}}}\text{ V}\]     

    D)        \[\text{14}.\text{2 }\times \text{ 1}{{0}^{-\text{3}}}\text{ V}\]   

    Correct Answer: B

    Solution :

     \[{{E}_{Ni-Cu}}=aT+\frac{b}{2}{{T}^{2}}\] \[=(1.63\times {{10}^{-6}})\times (100)-(0.42\times {{10}^{-6}}){{(100)}^{2}}\] \[\therefore \]  \[{{E}_{Ni-Cu}}=(1.63\times {{10}^{-4}})-2.1\times {{10}^{-4}}\]                 \[=14\times 2\times {{10}^{-4}}=1.42\times {{10}^{-3}}volt\].


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