VectorHard
Question
If 
= 0 , then :-
= 0 , then :-Options
A.
can be zero vector
can be zero vectorB.
can be zero vector
can be zero vectorC.can be perpendicular to 
can be perpendicular to D.All of the above
Solution
∵ 
= ABcos θ = 0
∴ either A = 0 or B = 0 or cosθ = 0 ⇒ θ = 90o
= ABcos θ = 0∴ either A = 0 or B = 0 or cosθ = 0 ⇒ θ = 90o
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