Haryana PMT Haryana PMT Solved Paper-2009

  • question_answer
    If the free electron density be n and relaxation time be t, the electrical conductivity of a conductor may be expressed as

    A) \[\frac{ne\tau }{{{m}_{e}}}\]                                     

    B) \[\frac{n{{e}^{2}}\tau }{{{m}_{e}}}\]

    C) \[\frac{n{{e}^{2}}}{\tau {{m}_{e}}}\]                                      

    D) \[\frac{{{m}_{e}}{{e}^{2}}\tau }{n}\]

    Correct Answer: B

    Solution :

                    Resistivity, \[\rho =\frac{{{m}_{e}}}{n{{e}^{2}}\tau }\] Conductivity,  \[\sigma =\frac{1}{\rho }=\frac{n{{e}^{2}}\tau }{{{m}_{e}}}\]


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