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JEE Main & Advanced Physics Vectors Question Bank Multiplication of Vectors

  • question_answer
    A vector \[\overrightarrow{A}\] points vertically upward and \[\overrightarrow{B}\]points towards north. The vector product \[\overrightarrow{A}\times \overrightarrow{B}\] is                        [UPSEAT 2000]

    A)                 Zero      

    B)                 Along west

    C)                 Along east          

    D)                 Vertically downward

    Correct Answer: B

    Solution :

                        Direction of vector A is along z-axis \\[\vec{A}=a\hat{k}\] Direction of vector B is towards north \ \[\vec{B}=b\hat{j}\]                 Now \[\vec{A}\times \vec{B}=a\hat{k}\times b\hat{j}=ab(-\hat{j})\]                 \ The direction is \[\vec{A}\times \vec{B}\] is along west.


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