Two identical long current carrying wires are bent into the shapes shown in the following figures. If the magnitude of magnetic fields at the centres…

Two identical long current carrying wires are bent into the shapes shown in the following figures. If the magnitude of magnetic fields at the centres P and Q of a semicircular arc are $\displaystyle \mathrm{B}_1$ and $\displaystyle \mathrm{B}_2$ respectively, then the ratio $\displaystyle \frac{B_1}{B_2}$ is $\displaystyle \_\_\_\_$.