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JEE Main & Advanced AIEEE Solved Paper-2003

  • question_answer
    Let F be the force acting on a particle having position vector r and \[\tau \] be the torque of this force about the origin. Then,     AIEEE  Solved  Paper-2003

    A) \[r\,.\,\tau =0\] and \[F\,.\,\,\tau \ne 0\]            

    B) \[r\,.\,\,\tau \ne 0\] and \[F\,.\,\,\tau =0\]

    C) \[r\,.\,\,\tau \ne 0\] and \[F\,.\,\,\tau \ne 0\]

    D) \[r\,.\,\,\tau =0\] and \[F\,.\,\,\tau =0\]

    Correct Answer: D

    Solution :

    The torque, \[\tau =r\times F\] As, \[\tau \] is perpendicular to both r and F, so r . \[\tau \] as well as F . \[\tau \] has to be zero.


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