A vector $\vec Q$ which has a magnitude of $8$ is added to the vector $\vec P$ which lies along $x-$ axis. The resultant of two vectors lies along $y-$ axis and has magnitude twice that of $\vec P$. The magnitude of is $\vec P$
A vector $\vec Q$ which has a magnitude of $8$ is added to the vector $\vec P$ which lies along $x-$ axis. The resultant of two vectors lies along $y-$ axis and has magnitude twice that of $\vec P$. The magnitude of is $\vec P$
- A
$\frac {6}{\sqrt 5}$
- B
$\frac {8}{\sqrt 5}$
- C
$\frac {12}{\sqrt 5}$
- D
$\frac {16}{\sqrt 5}$
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