the question is; if there only a current in coil a, and it is AC, calculate the rms current required in coil a to maintain an alternating flux in core section a with a peak value of 1.2T calculate the rm voltages at the two coil terminals if coil resistances are neglected (attached in the previous question which is continued on by this) So I derived the magnetic equivalent of this circuit which is basically mmf connected to reluctance (R) equivalent. What do I do from here? at the moment I am here; F = R * Flux With that F= NI, N = 200, R = Req which i have found already and flux = B*A 200 I = Req * B*A do i substitute in 1.2T for b and solve for I? then multiple by √2 or am i going in the complete wrong direction? help will be greatly appreciated.