magnetic effects of current Questions

A straight conductor carrying current splits into two parts forming a circular loop as shown in the figure. The radius of the circular loop is $R$. The total magnetic field at the centre of the loop is:

Two toroids $1$ and $2$ have total no. of turns $200$ and $100$ respectively with average radii $40\text{cm}$ and $20\text{cm}$ respectively. If they carry the same current $i$, what will be the ratio of the magnetic fields along the two loops?