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JEE Main & Advanced Physics Vectors Question Bank Multiplication of Vectors

  • question_answer
    The angle between two vectors \[-2\hat{i}+3\hat{j}+\hat{k}\] and \[\hat{i}+2\hat{j}-4\hat{k}\] is                                            [EAMCET 1990]

    A)                 0°           

    B)                 90°

    C)                 180°      

    D)                 None of the above

    Correct Answer: B

    Solution :

                        \[\cos \theta =\frac{\vec{A}.\vec{B}}{|\vec{A}||\vec{B}|}=\frac{-2+6-4}{\sqrt{14}\sqrt{21}}=0\] \ \[\theta =90{}^\circ \]


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