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J & K CET Engineering J and K - CET Engineering Solved Paper-2008

  • question_answer
    The vector \[\vec{a}\times (\vec{b}\times \vec{c})\] is coplanar with the vectors

    A)  \[\vec{b},\,\vec{c}\]             

    B)  \[\vec{a},\,\vec{b}\]

    C)  \[\vec{a},\,\vec{c}\]             

    D)  \[\vec{a},\,\,\vec{b}\,,\vec{c}\]

    Correct Answer: A

    Solution :

    Since,  \[\vec{b}\times \vec{c}\] is a vector perpendicular to \[\vec{b},\vec{c}\]. Therefore \[\vec{a}\times (\vec{b}\times \vec{c})\] is a vector again in plane of \[\vec{b},\vec{c}\].


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