Vector Algebra
RS Aggarwal
CBSE
Grade 12
Question:
If $|\vec{a} + \vec{b}| = |\vec{a} - \vec{b}|$, then angle between $\vec{a}$ and $\vec{b}$ is:
(a) $\pi/2$
(b) $0$
(c) $\pi/4$
(d) $\pi$
Step-by-Step Solution
Key Concept: 4 a . b = 0 => a . b = 0.
The detailed step-by-step mathematical proof is available inside the Mathbee app workspace.
Correct Answer: $\pi/2$
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