# Find the value of relative permeability of iron :

A current of 2 A passes through a coil of 350 turn wound on a ring of mean diameter 12 cm. The flux density established in the ring is 1.4 wb/m^{2}. Find the value of relative permeability of iron.

(a) 191

(b) 600

(c) 1200

(d) 210 x 10^{3}