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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 \[\mathbf{a}=\mathbf{i}-2\mathbf{j}\] and \[\mathbf{b}=2\mathbf{i}+\lambda \mathbf{j}\] are parallel, then \[\lambda \] is                                                 [RPET 1996]

    A)             4

    B)             2

    C)             ? 2

    D)             ? 4

    Correct Answer: D

    Solution :

                    \[\frac{1}{2}=\frac{-2}{\lambda }\Rightarrow \lambda =-4\].


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