Jyoti Pant , Meritnation Expert added an answer, on 20/5/12

**Unit Vectors**:

A vector of unit magnitude is called a unit vector . It has the same direction as that of the given vector .

A unit vector of is written as and is read as A cap.

= A Or

=

where A = magnitude of .

So, a unit vector in a given direction can also be defined as a vector in that direction divided by the magnitude of the given vector.

It has not unit and dimension. It represents direction only.

Example- are the unit vectors along x axis , y axis and z axis respectively.

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