alleryThe cross product of two nonzero vectors is zero when they are:
AOrthogonal
BUnit sized
CEqual sized
DParallel
Answer & Solution
Correct answer: D. Parallel
1. The cross product carries the sine of the angle between them.
2. The sine vanishes at zero or a straight angle.
3. So the vectors are parallel, or collinear.
_Source: syllabus Mathematics Part II, Chapter 10, Vector Algebra._
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