a rectangular coordinate system using vectors of unit magnitude. These are called unit vectors that we discuss now. A unit vector is a vector of unit magnitude and points in a particular direction. It has no dimension and unit.
It is used to specify a direction only. Unit vectors along the x -, y- and z -axes of a rectangular coordinate system are denoted by ɵ i , ɵ j and ˆ k , respectively, as shown in Fig. . (a).
Since these are unit vectors, we have