JEE Main & Advanced Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर JEE PYQ-Current Electricity Charging and Discharging of Capacitors

  • question_answer
    When 5V potential difference is applied across a wire of length 0.1 m, the drift speed of electrons \[2.5\times {{10}^{-4}}m{{s}^{-1}}.\]If the electron density in the wire is \[8\times {{10}^{28}}{{m}^{-3}},\]the resistivity of the material is close to [JEE MAIN 2015]

    A) \[1.6\times {{10}^{-6}}\Omega m\]

    B) \[1.6\times {{10}^{-5}}\Omega m\]

    C) \[1.6\times {{10}^{-8}}\Omega m\]

    D) \[1.6\times {{10}^{-7}}\Omega m\]

    Correct Answer: C

    Solution :

    [b]  \[\frac{\rho L}{A}=R=\frac{V}{i}=\frac{V}{neA{{V}_{d}}}\]
    \[\rho =\frac{E}{L}\frac{{}}{ne{{V}_{d}}}=\frac{\left( \frac{5}{0.1} \right)}{\left( 8\times {{10}^{28}} \right)\left( 1.6\times {{10}^{-19}} \right)\left( 2.5\times {{10}^{-4}} \right)}\]44
                \[=\left( \frac{50}{32} \right){{10}^{-5}}\]


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