Two identical circular loops P and Q each of radius r are lying in parallel planes such that they have common axis. The current through P and Q are J and 41 respectively in clockwise direction as seen from 0 . The net magnetic field at O is:

A

$$\frac{\mu_{0}I}{4\sqrt{2}r}$$ towards Q

B

$$\frac{3\mu_{0}I}{4\sqrt{2}r}$$ towards Q

C

$$\frac{\mu_{0}I}{4\sqrt{2}r}$$ towards P

D

$$\frac{3\mu_{0}I}{4\sqrt{2}r}$$ towards P