A) \[{{0}^{o}}\]
B) \[{{90}^{o}}\]
C) \[{{45}^{o}}\]
D) \[{{180}^{o}}\]
Correct Answer: B
Solution :
[b] \[\left| \vec{A}+\vec{B} \right|=\left| A-\vec{B} \right|=\theta ={{90}^{o}}\].
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