Let \({B}_{1}\) be the magnitude of magnetic field at center of a circular coil of radius R carrying current I . Let \({…

Let \({B}_{1}\) be the magnitude of magnetic field at center of a circular coil of radius R carrying current I . Let \({\mathrm{B}}_{2}\) be the magnitude of magnetic field at an axial distance ' x ' from the center. For \(\mathrm{x}:\mathrm{R}=3:4,\frac{{\mathrm{B}}_{2}}{{\mathrm{B}}_{1}}\) is :

[JEE Main 2025, 2 Apr (Shift 1)]