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JIPMER Jipmer Medical Solved Paper-2001

  • question_answer
    When the area of cross-section and length both are doubled, then its resistances :

    A)  will remain the same

    B)  will become half

    C)  will become four times

    D)  will become double

    Correct Answer: A

    Solution :

    For the resistance,     \[R=\frac{l}{A}\] Hence,                                  \[{{R}_{1}}=\frac{l}{A}\]                ?(i) according to question \[{{R}_{2}}=\frac{2l}{2A}\]               ?(ii) So, from equation (i) and (ii) we have \[{{R}_{1}}={{R}_{2}}\]


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