JEE Main & Advanced Sample Paper JEE Main Sample Paper-26

  • question_answer
    When a load of \[1.0\] kg is suspended from a \[1.0\] m long wire, its length increases by \[1.0\] mm. Its radius would change by:

    A)  \[1\,%\]                                    

    B)  \[2\,%\]

    C)  \[0.1\,%\]                                 

    D)  \[0.2\,%\]

    Correct Answer: D

    Solution :

    \[l\pi {{r}^{2}}\,=\] Constant  \[\frac{\Delta l}{l}+2\,\frac{\Delta r}{r}=0\]

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