One of the two identical conducting wires of length L is bent in the form of a circular loop and the other one into a circular coil of N identical turns. If the same current is passed in both, the ratio of the magnetic field at the central of the loop (B_L ) to that at the centre of the coil $\left(B_C\right),$ i.e. $\frac{B_L}{B_C}$ will be.