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Vector — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsVector1 Mark
MCQ
If $\stackrel{\circ}{A} \stackrel{\circ}{ u } \stackrel{\circ}{B} \quad \stackrel{\circ}{B} u A$ then the angle between $A$ and $B$ is
  • A
    $S _2$
  • B
    $S 3$
  • ✓
    $S$
  • D
    $S _4$
✓

Answer

Correct option: C.
$S$
(c) We know that $\vec{A} \times \vec{B}=-(\vec{B} \times \vec{A})$ because the angle between these two is always $90^{\circ$.But if the angle between $\vec{A}$ and $\vec{B}$ is 0 or $\pi$. Then $\vec{A} \times \vec{B}=\vec{B} \times \vec{A}=0$

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