MCQ
Two vector $A$ and $B$ have equal magnitudes. Then the vector $A+B$ is perpendicular to
- ✓$A \times B$
- B$A-B$
- C$3 A-3 B$
- DAll of these
✓
Answer
Correct option: A.
$A \times B$
(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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