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JEE Main & Advanced AIEEE Solved Paper-2008

  • question_answer
    The non-zero vectors \[\vec{a},\,\vec{b}\], and \[\vec{c}\] are related by \[\vec{a}=8\vec{b}\] and \[\vec{c}=-7\vec{b}\]. Then the angle between \[\vec{a}\] and \[\vec{c}\] is       AIEEE  Solved  Paper-2008

    A) \[\frac{\pi }{2}\]              

    B)                        \[\pi \]                 

    C)                        0                                             

    D)                        \[\frac{\pi }{4}\]

    Correct Answer: B

    Solution :

                    Clearly \[\vec{a}\] and \[\vec{c}\] are anti parallel. \[\therefore \] Angle between \[\vec{a}\] and \[\vec{c}\] is \[\pi \].


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