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JEE Main & Advanced Sample Paper JEE Main Sample Paper-31

  • question_answer
    A uniform disc of mass m and radius R is rolling up a rough inclined plane which makes an angle of \[{{30}^{o}}\] with the horizontal. If forces acting are gravitational and frictional, then value of \[\mu \] for maximum magnitude of the static fractional force acting on the disc is :

    A) \[\frac{1}{\sqrt{3}}\]            

    B)                    \[\frac{1}{2\sqrt{3}}\]

    C) \[\frac{1}{3\sqrt{3}}\]    

    D) \[\frac{1}{3}\]

    Correct Answer: C

    Solution :

    for pure rolling on inclined plane \[\mu >\tan \theta /(1+m{{r}^{2}}/I)\]                


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