Two circular coils $$P$$ and $$Q$$ of 100 turns each have same radius of $$\pi$$ cm. The currents in $$P$$ and $$Q$$ are 1 A and 2 A respectively. $$P$$ and $$Q$$ are placed with their planes mutually perpendicular with their centers coincide. The resultant magnetic field induction at the center of the coils is $$\sqrt{x}$$ mT, where $$x =$$ [Use $$\mu_0 = 4\pi \times 10^{-7}$$ T m A$$^{-1}$$]