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AIIMS AIIMS Solved Paper-2009

  • question_answer
    A steady current is set up in a matallic wire of non-uniform cross-section. How is the rate of flow K. of electrons related to the area of cross-section A?

    A) k is independent of A

    B) \[K\propto {{A}^{-1}}\]

    C) \[K\propto A\] 

    D)                       \[K\propto {{A}^{2}}\]  

    Correct Answer: C

    Solution :

    Resistance of wire \[R=\frac{\rho l}{A}\] Rate of flow of electrons K is equal to the current flowing in wire i.e.,          \[i\propto A\] also,          \[i\propto \frac{1}{R}\propto A\] So,         \[K\propto A\]


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