2. Questions Bank
  3. JEE Main & Advanced
  4. Physics
  5. Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर

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

  • question_answer
    The thermo e.m.f. of a thermo-couple is \[25\mu V{{/}^{o}}C\] at room temperature. A galvanometer of 40 ohm resistance, capable of detecting current as low as \[{{10}^{-5}}A,\] is connected with the thermocouple. The smallest temperature difference that can be detected by this system is                                  [AIEEE 2003]

    A)            \[{{20}^{o}}C\]                    

    B)            \[{{16}^{o}}C\]

    C)            \[{{12}^{o}}C\]                    

    D)            \[{{8}^{o}}C\]

    Correct Answer: B

    Solution :

                       \[e=iR\] Þ \[25\times {{10}^{-6}}\times \Delta \theta ={{10}^{-5}}\times 40\]            \[\Delta \theta =\frac{40\times {{10}^{-5}}}{25\times {{10}^{-6}}}=\frac{400}{25}=16{}^\circ C\]


You need to login to perform this action.
You will be redirected in 3 sec spinner