Question

what do you mean by null vector and state its application?

Answer 1

A null vector is a vector having magnitude equal to zero.It is represented by . A null vector has no direction or it may have any direction. Generally a null vector is either equal to resultant of two equal vectorsacting in opposite directions or multiple vectors in different directions.
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Answer 2

Zero vector Is vector which has zero magnitude and arbitrary direction. If we multiply any vector with zero result can't be taken as zero, it's should bezero vector, thus herelies the significance of zero vector.