Vectors Question 140

Question: If $ \overrightarrow{P}.\overrightarrow{Q}=PQ, $ then angle between $ \overrightarrow{P} $ and $ \overrightarrow{Q} $ is

[AIIMS 1999]

Options:

A) 0°

B) 30°

C) 45°

D) 60°

Show Answer

Answer:

Correct Answer: A

Solution:

$ \cos \theta =\frac{\vec{P}.\vec{Q}}{PQ}=1 $ \ $ \theta =0{}^\circ $