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  4. |P × Q| = PQ then angle between P and Q is

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Q. $|\overrightarrow{P} \, \times\, \overrightarrow{Q}|$ = PQ then angle between $\overrightarrow{P}$ and $\overrightarrow{Q}$ is

Motion in a Plane

Solution:

$|\overrightarrow{P} \, \times\, \overrightarrow{Q}|$ = PQ sin $\theta$ = PQ. Hence sin $\theta$ = 1 . Which given $\theta = \pi /2$