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3.1 vectors — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics3.1 vectors1 Mark
MCQ
Two vector $A$ and $B$ have equal magnitudes. Then the vector $\mathop A\limits^ \to + \mathop B\limits^ \to $ is perpendicular to
  • ✓
    $\mathop A\limits^ \to \times \mathop B\limits^ \to $
  • B
    $\mathop A\limits^ \to - \mathop B\limits^ \to $
  • C
    $3\mathop A\limits^ \to \times 3\mathop B\limits^ \to $
  • D
    All of these
✓

Answer

Correct option: A.
$\mathop A\limits^ \to \times \mathop B\limits^ \to $
a
(a) $\vec A \times \vec B$ is a vector perpendicular to plane $\vec A + \vec B$ and hence perpendicular to $\vec A + \vec B$.

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