JEE Main & Advanced Sample Paper JEE Main - Mock Test - 15

  • question_answer
    A spool is pulled at an angle of \[\theta \]with the horizontal on a rough horizontal surface as shown in the figure. If the spool remains at rest, then the angle \[\theta \] is equal to

    A) \[30{}^\circ \]                   

    B) \[60{}^\circ \]                   

    C) \[45{}^\circ \]                   

    D) \[75{}^\circ \]

    Correct Answer: B

    Solution :

    [b] Net torque about \[P=0\] \[F\cos \theta (2R-R\,cos\theta )=F\sin \theta \,R\sin \theta \] \[2\cos \theta =1\] \[\Rightarrow \,\,\,\theta =60{}^\circ \]

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