The vector product of two parallel vectors is
- A. zero
- B. maximum and equal to AB
- C. equal to AB cos theta
- D. a scalar
Explanation
The cross product has magnitude AB sin theta, and sin 0 is zero, so parallel vectors give a null vector. It is maximum for perpendicular vectors, which is the opposite of the dot product and the easiest way to keep the two straight. The result of a cross product is always a vector, never a scalar.