1  Components of a vector
Let us take the points A(1, 0, 0), B(0, 1, 0) and C(0, 0, 1) on the x-axis, y-axis and
z-axis, respectively Then, clearly
| OA | 1,| OB|
uuur=
uuur  = 1 and | OC |
=1
uuur
The vectors OA,  OB and OC
uuur
uuur
uuur , each having magnitude 1,
are called unit vectors along the axes OX, OY and OZ,
respectively, and denoted by 
ˆ
ˆ ˆ
,   and  
i j
k , respectively
(Fig 10 13) Now, consider the position vector OP
uuur
 of a point P(x, y, z) as in Fig 10