First slide

Vectors

Question

Two vector A and B have equal magnitudes. Then the vector A+B is perpendicular to

Moderate

A

$A \times B$
B

A-B
C

3A-3B
D

All of these

Solution

$\vec{A} \times \vec{B} is a vector perpendicular to plane \vec{A} + \vec{B} and hence perpendicular to \vec{A} + \vec{B}$

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