We write it as
ˆa  =
|1
| a
a
r
r
�Note  For any scalar k, 0 = 0 k
r
r
10 5 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