Q. 5
Mark (√) against the correct answer in each of the following:
The vector 
is a
A. null vector
B. unit vector
C. a constant vector
D. none of these
Answer :
Tip – Magnitude of a vector 
is given by 
A unit vector is a vector whose magnitude = 1.
Formula to be used - 
Hence, magnitude of 
will be given by 
= 1 i.e a unit vector
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