JEE Main & Advanced AIEEE Solved Paper-2002

  • question_answer
    If a spring has time period T, and is cut into n equal parts, then the time period of each part will be   AIEEE  Solved  Paper-2002

    A) \[T\sqrt{n}\]    

    B)                           \[\frac{T}{\sqrt{n}}\]                        

    C)           \[nT\]                      

    D)           T

    Correct Answer: B

    Solution :

    As we know that spring constant of spring is inversely proportional to length of spring, so new spring constant for each part is given by \[k'=nk\] where, k is the spring constant of whole spring. From the theory of spring pendulum, we know that time period of spring pendulum is inversely proportional to square root of spring constant.              \[i.e.\],    \[T\propto \frac{1}{\sqrt{k}}\]   \[\left( \because T=2\pi \sqrt{\frac{m}{k}} \right)\]                 \[T'=\propto \frac{1}{\sqrt{nk}}\]      (T'= new time period)              So,             \[T'=\frac{1}{\sqrt{n}}\]


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