Question

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

• A. zero
• B. $\pi /2$
• C. $\pi$
• D. none of the above

Answer 1

Answer: (B)

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