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Vector Algebra question

2019 · 9 Apr · Shift 2 · Q31

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PYQ Library
JEE Main
Mathematics
Vector Algebra
2019 · 9 Apr · Shift 2 · Q31

Vector Algebra question

2019 · 9 Apr · Shift 2 · Q31

JEE MainMathematicsVector AlgebraMCQ+4 / −1

If a unit vector

\overrightarrow a

makes angles

\pi

/3 with

\widehat i

,

\pi

/ 4 with

\widehat j

and

\theta \in

(0,

\pi

) with

\widehat k

, then a value of

\theta

is :-

A
${{5\pi } \over {6}}$
B
${{5\pi } \over {12}}$
C
${{2\pi } \over {3}}$
D
${{\pi } \over {4}}$

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