A magnetic circuit carries a flux $$\phi_i$$, in the iron part and a flux $$\phi_g$$ in the air gap. Then leakage coefficient is

A

$$\phi_i \phi_g$$

B

$$\frac{\phi_i}{\phi_g}$$

C

$$\frac{\phi_g}{\phi_i}$$

D

$$\phi_g \times \phi_i$$