An electromagnetic actuator has 2 iron poles with 5mm airgap between them. Each pole has an area of 15 cm^2. A coil of 100 turns is used to create a flux density of 1.2T in the airgap. Assume core has infinite permeability. Calculate the required coil current. So far I have the flux(phi) = B*A = 1.2 x 1.5 x 10^-3 = 1.8x10^03. Then from there I'm not sure where to go.