• # question_answer Which of the following statement is correct :- A)  If $\theta ={{45}^{o}},$ then $\bigcirc -\vec{A}\times \vec{B}=-\vec{A}.\vec{B}$B)  If $\left| {\vec{A}} \right|=\left| {\vec{B}} \right|,$ then $(\vec{A}+\vec{B})$ must be parallel to $(\vec{A}-\vec{B})$C)  If $\vec{A}=\vec{O},$ then $\left| \vec{A}+\vec{B} \right|=\left| \vec{A}-\vec{B} \right|$D)  None of the above

Solution :

If $\vec{A}=\vec{O},$ the $\left| \vec{A}+\vec{B} \right|=\left| \vec{A}-\vec{B} \right|$ $\Rightarrow$    $\left| \vec{O}+\vec{B} \right|=\left| \vec{O}-\vec{B} \right|$ $\Rightarrow$ $B=B$

You need to login to perform this action.
You will be redirected in 3 sec