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NEET Sample Paper NEET Sample Test Paper-8

  • question_answer
    If a copper wire is stretched to make it \[0.1%\]longer. The percentage change in its resistance is:

    A)  \[0.2%\]increases       

    B)  \[0.2%\]decrease

    C)  \[0.1%\]increase        

    D)  \[0.1%\] decrease

    Correct Answer: A

    Solution :

    For a given wire,  \[R=\frac{PL}{S}\] with LX S = volume = V = constant So, that          \[R=P\frac{{{L}^{2}}}{V}\] \[\Rightarrow \]                               \[\frac{\Delta R}{R}=2\frac{\Delta L}{L}\] \[=2(0.1%)=02%\](increase)


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