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Unit Vectors

2.8 UNIT VECTORS

A unit vector ᾶ is having unit magnitude. It is defined as

The direction of vector a is along the direction of A.

Let (Refer Fig. 2.7)     i = unit vector along x direction

j = unit vector alongy direction

k = unit vector alongy direction

 

and A is having scalar components Ax, Ay and Az in x, y and z directions respectively

so