12th Class Mathematics Sample Paper Maths Olympiad Model Test Paper-10

  • question_answer
    If \[\overrightarrow{a}=\hat{i}+\hat{j}+\hat{k},\] \[\overrightarrow{c}=\hat{j}-\hat{k}\] are given vectors, then find a vector \[\overrightarrow{b}\] satisfying the equations \[\overrightarrow{a}\times \overrightarrow{b}=\overrightarrow{c}\]and \[\overrightarrow{a}\times \overrightarrow{b}=3\].

    A)  \[\frac{3}{5}\hat{i}+\frac{4}{5}\hat{j}+\frac{2}{5}\hat{k}\]    

    B)  \[\frac{5}{3}\hat{i}+\frac{2}{3}\hat{j}+\frac{2}{3}\hat{k}\]

    C)  \[\frac{1}{5}\hat{i}+\frac{2}{5}\hat{j}+\frac{3}{5}\hat{k}\]    

    D)  \[\frac{2}{3}\hat{i}+\frac{5}{3}\hat{j}+\frac{4}{3}\hat{k}\]

    E)  None of these

    Correct Answer: B


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