JEE Main & Advanced Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर Question Bank Critical Thinking

  • question_answer
    For copper-iron (Cu-Fe) couple, the thermo e.m.f. (temperature of cold junction\[=0{}^\circ C\]) is given by\[E=(14\theta -0.02{{\theta }^{2}})\mu V\]. The neutral temperature will be

    A)            \[350{}^\circ C\]                 

    B)            350 K

    C)            \[560{}^\circ C\]                 

    D)            560 K

    Correct Answer: A

    Solution :

                       Comparing the given equation with standard equation \[E=\alpha t+\frac{1}{2}\beta \,{{t}^{2}},\] we get \[\alpha =14\] and \[\frac{1}{2}\beta =-\,0.02\]  Þ b = ? 0.04 Hence neutral temperature \[{{t}_{n}}=\,-\,\frac{\alpha }{\beta }\]\[=\,-\,\frac{14}{-\,0.04}=350{}^\circ C\]


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