12th Class Mathematics Sample Paper Maths Olympiad Model Test Paper-12

  • question_answer
    Let \[\hat{u}\] and \[\hat{v}\]  be unit vectors such that \[\hat{u}.\,\hat{v}=0.\] If \[\overrightarrow{r}\] is any vector coplanar with \[\hat{u}\] and \[\hat{v}\], then the magnitude of the vector \[\overrightarrow{r}\times \left( \hat{u}\times \hat{v} \right)\]  is _____.

    A)  \[|\overrightarrow{r}|\]    

    B)  \[2|\overrightarrow{r}|\]

    C)  1                                

    D)  0

    E)  None of these

    Correct Answer: A

    Solution :

    Not Available                

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