MCQ
If $\left| {{{\vec v}_1} + {{\vec v}_2}} \right| = \left| {{{\vec v}_1} - {{\vec v}_2}} \right|$ and ${{{\vec v}_1}}$ and ${{{\vec v}_2}}$ are finite, then
  • A
    ${{{\vec v}_1}}$ is parallel to ${{{\vec v}_2}}$
  • B
    ${{{\vec v}_1} = {{\vec v}_2}}$
  • C
    $\left| {{{\vec v}_1}} \right| = \left| {{{\vec v}_2}} \right|$
  • ${{{\vec v}_1}}$ and ${{{\vec v}_2}}$ are mutually perpendicular

Answer

Correct option: D.
${{{\vec v}_1}}$ and ${{{\vec v}_2}}$ are mutually perpendicular
d

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