A unit vector has
- A. magnitude one and specifies direction only
- B. zero magnitude
- C. magnitude equal to the vector it came from
- D. no direction
Explanation
Dividing any vector by its own magnitude gives a unit vector along the same line, which carries the direction information with the size stripped away. The unit vectors i, j and k along the three axes are used to write any vector in component form. A null vector, by contrast, has zero magnitude and an undefined direction.