MCQ
$|\vec{a}+\vec{b}|=|\vec{a}-\vec{b}| \Rightarrow$
- A$|\vec{a}|=|\vec{b}|$
- B$\vec{a} \| \vec{b}$
- ✓$\vec{a} \perp \vec{b}$
- D$|\vec{a}|=0$
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