Question

The low voltage release of an AC motor starter consist of a solenoid into which an iron plunger is drawn against a spring

The resistance of the solenoid is 35 ohm, when connected to a 220 volt 50Hz AC supply the current taken at first is 2A, when plunger is drawn into the full in position, the current falls to 0.74

Calculate the inductance of the solenoid for both positions of the plunger and the maximum value of flux-linkages in Weber turns for the "full-in" position of the plunger.