Match the List-I with List- II : 

	List- I  (Current configuration)		List-II (Magnitude of Magnetic field at point O)
A)		I)	${\mathrm{B}}_0=\frac{{\mathrm{\mu }}_0\mathrm{I}}{4\mathrm{\pi r}}[\mathrm{\pi }+2]$
B)		II)	${\mathrm{B}}_0=\frac{{\mathrm{\mu }}_0}{4}\frac{\mathrm{I}}{\mathrm{r}}$
C)		III)	${\mathrm{B}}_0=\frac{{\mathrm{\mu }}_0\mathrm{I}}{2\mathrm{\pi r}}[\mathrm{\pi }-1]$
D)		IV)	${\mathrm{B}}_0=\frac{{\mathrm{\mu }}_0\mathrm{I}}{4\mathrm{\pi r}}[\mathrm{\pi }+1]$

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