question_answer

If \[\left| \vec{A}-\vec{B} \right|=\left| {\vec{A}} \right|=\left| {\vec{B}} \right|,\]the angle between A and B is

A) \[60{}^\circ \]

B) \[0{}^\circ \]

C) \[120{}^\circ \]

D) \[90{}^\circ \]

Correct Answer: A

Solution :

As, \[\left| \vec{A}-\vec{B} \right|=\left| {\vec{A}} \right|=\left| {\vec{B}} \right|\] so the triangle ops is are equilateral triangle, hence Lops = \[60{}^\circ \].nnnnn Hence, the correction option is [a].