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NEET Sample Paper NEET Sample Test Paper-59

  • question_answer
    If the two vectors \[\overrightarrow{A}=2\hat{i}+3\hat{j}+4\hat{k}\]  and \[\overrightarrow{B}=\hat{i}+2\hat{j}-n\hat{k}\] are perpendicular, then the value of n is:

    A) 1                     

    B)   2

    C) 3                                 

    D) 5

    Correct Answer: B

    Solution :

    [b] Two, vectors are said to be perpendicular when their dot product is zero. \[\vec{A}.\vec{B}=0\] \[(2\hat{i}+3\hat{j}+4\hat{k})(\hat{i}+2\hat{j}-n\hat{k})=0\] \[2+64n=0\] \[n=2\]     


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