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+ 
+ 
+ We can approach this problem using XCOS simulation   
+ 
+ In this simulation   
+ 
+ 1)For injecting unit current at bus1 keeping bus2 open circuit,we use a current source of 1 unit which is  
+      switched on from t=0 to t=2. During this period we can observe the voltage waveforms of V1 and V2 and 
+       compare with the results given in the textbook                                                       
+ 
+ 2)For injecting unit current at bus2 keeping bus1 open circuit,we use a current source of 1 unit which is  
+      switched on from t=4 to t=6. During this period we can observe the voltage waveforms of V1 and V2 and 
+       compare with the results given in the textbook                                                       
+ Zbus  =
+ 
+    7.    4.  
+    4.    6.  
+