A building has an electrical load of 500 kVA at 0.70 power factor, lagging.

Among the load is a 50 HP induction motor with an efficiency of 0.93 and a power factor 0.90 (lagging). It has been decided to replace the induction motor with a synchronous motor of the same size, efficiency, and power factor (leading). Determine the impact of this replacement on:

a. The change of the power factor of the building.

b. The variation in the total line current that the building draws if it served by 208 Y/120-V source.