Q. 174.3( 20 Votes )

Let and be two unit vectors and q is the angle between them. Then is a unit vector if
A.

B.

C.

D.

Answer :

let the two unit vectors are and is the angle between.

Then


Then this is () is unit vector if






scalar product is cumulative.








Hence, () is unit vector if .


The correct answer is (D).

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