A single-phase transformer has two 120V windings (primary) and one 240V windings (secondary) such that with the two primary in series properly (dot to no dot) the transformer is a 240:240V transformer.
A test is run on one of the primary coils (one of the 120V coils) with the other coils open-circuited. The following values are found: V = 120V, I = 0.8A, f=60Hz
Assume NO leakage inductance, coil resistance, or magnetic losses, and assume the coefficient of coupling between any 2 coils is k = 1.
What is the magnetizing inductance (Lm) for the coil tested above?