6-1 In a three-phase, 2-pole ac machine, assume that the neutral of the wye-connected stator windings is accessible. The rotor is electrically open-circuited. The phase-a is applied a current ia(t) = 10 sin oot. Calculate Ba at the following instants of ot: 0°, 90°, 135°, and 210°. Also, plot the Ba(0) distribution at these instants.

Fig: 1