A single phase 400V, 50Hz, transformer is built from stampings having a relative permeability of 1000. The length of flux path is 2.5m, The area cross section of the core is $2.5×10^{-3} m^2$ and the primary winding has 800 turns. Estimate the maximum flux and no load current of transformer. The iron loss at the working flux density is 2.6 W/kg. Iron weight $7.8\times 10^3 kg/m^3$ . Stacking factor is 0.9.