First slide

Scalars and Vectors

Question

If for two vectors $\vec{A} and \vec{B}, \vec{A} \times \vec{B} = 0$ , the vectors

Moderate

A

are perpendicular to each other
B

are parallel to each other
C

act at an angle of 60^o
D

act at an angle of 30^o

Solution

$\vec{A} \times \vec{B} = 0 ∴ \sin θ = 0 ∴ θ = 0^{\circ} or 180^{0}$
Two vectors will be parallel or anti-parallel to each other.

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