Kinematics Question 258
Question: If $ \overset{\to }{\mathop{A}}\times \overset{\to }{\mathop{B}}=\overset{\to }{\mathop{B}}\times \overset{\to }{\mathop{A}} $ then the angle between A and b is [AIEEE 2004]
Options:
A) p / 2 $
$
B) p / 3
C) p
D) p / 4
Correct Answer: C We know that $ \overrightarrow{A}\times \overrightarrow{B}=-(\overrightarrow{B}\times \overrightarrow{A}) $ because the angle between these two is always 90°. But if the angle between $ \overrightarrow{A} $ and $ \overrightarrow{B} $ is 0 or p . Then $ \overrightarrow{A}\times \overrightarrow{B}=\overrightarrow{B}\times \overrightarrow{A}=0 $ .
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