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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 has uniform potential gradient. The specific resistance of the material of the potentiometer wire is 10?7 ohm?meter and the current passing through it is 0.1 ampere; cross-section of the wire is 10?6 m2.  The potential gradient along the potentiometer wire is             [KCET 2003]

    A)         \[{{10}^{-4}}\] V/m

    B)         \[{{10}^{-6}}\] V/m

    C)         \[{{10}^{-2}}\] V/m    

    D)         \[{{10}^{-8}}\] V/m

    Correct Answer: C

    Solution :

                                             Potential gradient (x) \[=\frac{i\rho }{A}\]\[=\frac{0.1\times {{10}^{-7}}}{{{10}^{-6}}}={{10}^{-2}}\,V/m\]


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