A 3-phase Y-connected source supplies power to two three-phase loads through a three- phase cable having an impedance of (0.2+j0.1) $2 per phase. Load 1 is Y-connected with an impedance of (12+j9) 2 per phase. Load 2 is A-connected with an impedance of 27 230 per phase. Assume that the source, loads, and the cable impedances are all balanced, and the load voltage is maintained constant at 450 V, and the phase sequence is a-b-c. (a) Calculate the line current, complex power, and power factor of the combined loads. (8 marks) (b) Determine the voltage, complex power and power factor of the source. (7 marks) (c) If the two-wattmeter method is used to measure the total active power of the two loads, what would be the readings of the wattmeters. (5 marks) (d) Provide a solution to improve the power factor of the combined loads to unity. What is the corresponding current taken by the combined loads? (5 marks)