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JEE Main & Advanced Mathematics Vector Algebra Question Bank Scaler or Dot product of two vectors and its application

  • question_answer
    If the vectors \[a\mathbf{i}+b\mathbf{j}+c\mathbf{k}\] and \[p\mathbf{i}+q\mathbf{j}+r\mathbf{k}\] are perpendicular, then [RPET 1989]

    A)             \[(a+b+c)\,(p+q+r)=0\]

    B)             \[(a+b+c)\,(p+q+r)=1\]

    C)             \[ap+bq+cr=0\]

    D)             \[ap+bq+cr=1\]

    Correct Answer: C

    Solution :

                    It is obvious.


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