Let and . If the -component of is , the value of…

MATHEMATICS · Single correct · CBSE · Mathematics · Vector Algebra · Vector Algebra

Problem

Let

\mathbf a=(2,k,-1)

and

\mathbf b=(3,1,4)

. If the

\hat{i}

-component of

\mathbf a\times\mathbf b

9

, the value of

k

is (a)

-\dfrac{5}{2}

(b)

\dfrac{5}{2}

(c)

2

(d)

-2