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WB JEE Medical WB JEE Medical Solved Paper-2009

  • question_answer
    Given \[\vec{C}=\vec{A}\times \vec{B}\]and \[\vec{D}=\vec{B}\times \vec{A}.\]What is the angle between \[\vec{C}\] and \[\vec{D}\]?

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

    B)  \[{{60}^{o}}\]

    C)  \[{{90}^{o}}\]                                   

    D)  \[\text{18}{{\text{0}}^{\text{o}}}\]

    Correct Answer: D

    Solution :

                     \[\text{\vec{C}}\]  and \[\text{\vec{D}}\] are   antiparallel   since \[\vec{A}\times \vec{B}=-(\vec{B}\times \vec{A})\] Hence, angle between \[\text{\vec{C}}\]and \[\text{\vec{D}}\]is \[\text{18}{{\text{0}}^{\text{o}}}.\]


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