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NEET Sample Paper NEET Sample Test Paper-36

  • question_answer
    A bar magnet is oscillating in the Earth's magnetic field with a period T. What happens to its period and motion if its mass is quadrupled

    A)  Motion remains S.H.M. with time period = 2T

    B)  Motion remains S.H.M. with time period = 4T

    C)  Motion remains S.H.M. and period remains nearly constant

    D)  Motion remains S.H.M. with time period \[=\frac{T}{2}\]

    Correct Answer: A

    Solution :

     As \[T\propto \sqrt{I},\]where I = moment of inertia \[=\frac{\omega {{L}^{2}}}{12}\Rightarrow T\propto \sqrt{w}\](w = Mass of magnet. If \[w\to \] quadrupled, then\[T\to \]doubled, i.e., \[T'=2T\]


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