First slide

Vectors

Question

The angle between $\vec{A} - \vec{B} a n d \vec{A} x \vec{B} i s (\vec{A} \neq \vec{B})$ :

Moderate

A

90°
B

120°
C

45°
D

60°

Solution

$\vec{A} - \vec{B}$ is in the plane of $\vec{A}$ and $\vec{B}$
$\vec{A} \times \vec{B}$ is $⊥^{r}$ to plane of $\vec{A}$ and $\vec{B}$
$∴$ Angle between them is $90^{o}$

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