VectorHard
Question
Let 
and 
If 
is a vector such that 
and is 30o, then 
is equal to
and If is a vector such that and is 30o, then is equal toOptions
A.
B.
C.2
D.3
Solution
Note In this Question vector 
is not given, therefore, we cannot apply the formulae of 
(vector triple product).
Now,
.... (i)
Again,
⇒
Since,
⇒
⇒
⇒
⇒
⇒
⇒
⇒
⇒
⇒
∴ From Eq. (i)
is not given, therefore, we cannot apply the formulae of (vector triple product).Now,
.... (i)Again,
⇒
Since,
⇒
⇒
⇒
⇒
⇒
⇒
⇒
⇒
⇒
∴ From Eq. (i)
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