Q.

Define unit vector, null vector and position vector?

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Detailed Solution

Unit Vector : A vector which has unit magitude is called a unit vector.
A^=A|A|
Null vector : A vector Whose Magnitude is Zero. Then the vector is Known as Null vector.
Position vector : The position of the particle in the space explained by vector is called position vector.
If x, y, z are co-ordinates of a point ‘p’ and ‘o’ is the origin, then
OP=r=xi^+yj^+zk^;|r|=x2+y2+z2

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