Question

When two vectors \[\vec P\] and \[\vec Q\] are parallel to each other, what is the magnitude of their cross product \[\vec P\] × \[\vec Q\]?

Options

• Maximum value

• Zero

• PQ

• PQ sin 45°

Answer 1

Zero

Explanation:

When two vectors are parallel, the angle between them is 0°. Since |R| = PQ sin θ, and sin(0°) = 0, the magnitude of the cross product is zero.