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

  • question_answer
    A potentiometer wire has length 10 m and resistance \[20\,\Omega \]. A 2. 5 V battery of negligible internal resistance is connected across the wire with an \[80\,\Omega \] series resistance. The potential gradient on the wire will be                                                                      [KCET 1994]

    A)                    \[5\times {{10}^{-5}}\,V/mm\]

    B)                                      \[2.5\times {{10}^{-4}}\,V/cm\]

    C)                    \[0.62\times {{10}^{-4}}\,V/mm\]                          

    D)            \[1\times {{10}^{-5}}\,V/mm\]

    Correct Answer: A

    Solution :

                 Potential gradient \[x=\frac{e}{(R+{{R}_{h}}+r)}\cdot \frac{R}{L}\]            Þ \[x=\frac{2.5}{(20+80+0)}\times \frac{20}{10}=5\times {{10}^{-5}}\frac{V}{mm}\]


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