The formula to calculate the magnetic field (B) at the centre of a current carrying circular loop is given by
B=2Rμ0i...(1)
where, μ0 is the permeability of free space, i is the current and R is the radius of the loop.

BV,BH are the magnetic field due to the vertical and the horizontal loop, which by magnitude are equal.
The resultant magnetic field (Bnet) at the centre is, then, given by
Bnet =B2+B2=2B=2×0.22×4π×10−7×2
=628×10−8T
