1. A power system network is shown in Fig.1. the values marked are impedance in per unit on a base of 100 MVA. The currents entering buses 1 and 2 are I₁=1.5-j2 pu, I2= 0.3-j1.3 pu (a) Determine the bus admittance matrix. (b) Determine the voltage at all buses 0 j0.5 j1.02 0.02 + 10.04 0.01j0.03 2 0.0125+j0.025 10.4 + j0.2 Fig.1.