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NEET Sample Paper NEET Sample Test Paper-74

  • question_answer
    If E denotes electric field in a uniform conductor, I is corresponding current through it and \[{{v}_{d}}\] is drift velocity of \[{{e}^{-}}\], then the correct graph is

    A)         

    B)   

    C)          

    D)   

    Correct Answer: A

    Solution :

    \[V=iR\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(V=Potential\,\,difference)\] \[EL=iR~~~~~\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,~~~~\left( V=EL \right)\] \[E=\frac{iR}{L}~=\frac{i\rho }{A}~~~\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,~~~~\left( R=\frac{\rho L}{A} \right)\] \[\Rightarrow \,\,\,\,\,\,\,\,\,\,\,\,\,\,E=\frac{n{{e}^{-}}A\,{{v}_{d}}\rho }{A}\] \[\Rightarrow \,\,\,\,\,\,\,\,\,\,\,\,\,\,E=n{{e}^{-}}\,{{v}_{d}}\,\rho \,\,\,or\,\,\,{{v}_{d}}\propto E\]


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