A point charge Q is located on the axis of a disk of radius R at a distance b from the plane of the disk as shown in below figure. Find the value of R, if \(\frac{1}{4}th\) of the electric flux from the charge passes through the disk?
1
\(\sqrt 3 b\)
2
\(\sqrt {3\pi } b\)
3
\(\sqrt {2\pi } b\)
4
\(\sqrt 2 b\)