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NEET Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर NEET PYQ-Current Electricity Charging Capacitors

  • question_answer
    A thermocouple of negligible resistance, produces an emf of \[40\mu V{{/}^{o}}C\] in the linear range of temperature. A galvanometer of resistance \[10\,\Omega \] whose sensitivity is \[1\mu A/div,\] employed with the thermocouple. The smallest value of temperature difference that can be detected by the system will be                                [AIPMT (M) 2011]

    A)  \[0.5{}^\circ C\]          

    B)       \[1{}^\circ C\]

    C)  \[0.1{}^\circ C\]          

    D)       \[0.25{}^\circ C\]

    Correct Answer: D

    Solution :

    [d] For minimum deflection of 1 division require current \[=1\mu A\]
    voltage required \[=iR=1\times 10=10\mu V\]
    \[\therefore \]      \[40\mu V\cong {{1}^{o}}C\]
                \[10\mu V\cong {{\frac{1}{4}}^{o}}C\]
                            \[={{0.25}^{o}}C\]


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