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    Question

    The value of λ for which the 2 vectors 2i – j + 2k

    and 3i + λ j + k are perpendicular is 
    A -8 Correct Answer Incorrect Answer
    B 8 Correct Answer Incorrect Answer
    C 2 Correct Answer Incorrect Answer
    D 4 Correct Answer Incorrect Answer

    Solution

    Dot product of two mutually perpendicular vectors is zero. ⇒ 2 x 3 + (-1)λ + 2 x 1 = 0 ⇒   λ = 8 

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