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Q4. An unbalanced three phase load is supplied from a 440 V 50Hz four wire supply. The current in the red line is 6 A lagging by 30°, the current in the yellow line is 5A in phase and the current in the blue line is 7 A leading by 15°. Determine EACH of the following:

(a) The current in the neutral line;

(b) The phase angle of the neutral current relative to the voltage between the red line and the neutral line;

(c) The total power dissipated by the circuit.