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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 1

  • question_answer
    In a Vernier calipers, n divisions of its main scale match with (n + 5) divisions on its Vernier scale. Each division of the main scale is of \['\ell '\] units. Using the Vernier principle, find the least count.

    A) \[\frac{\ell }{n+5}\]  

    B) \[\frac{2\ell }{n+5}\]

    C) \[\frac{5\ell }{n+5}\]

    D) \[\frac{7\ell }{n+5}\]

    Correct Answer: C

    Solution :

    [c] \[nS=(n+5)v\] \[(S-v)=\frac{5v}{n}\]                ??(i)             \[n\ell =\left( n+5 \right)v\]                      ??..(ii) Least count \[=S-v=\frac{5\ell }{n+5}\]


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