Answer: a x b = -(b x a).
- A a x b = b x a
- B a x b = -(b x a)
- C a x b = 0 always
- D a x b is a scalar
Correct answer: B. a x b = -(b x a)
Explanation: Cross product is anti-commutative: a x b = -(b x a). Swapping the order reverses direction.
Triangle law of vector addition: placing vector b at the head of vector a, the diagonal from the start to the final head gives the resultant a + b.
Concept context
Vectors, dot product, cross product, and geometric applications