The network shown in the following figure is a linear passive and bilateral network. Use the data given in Fig. (a) and apply the principle of reciprocity and superposition to determine current i_x in Fig. (b).
By applying the homogeneity property to Fig. (a), we get circuit given in Fig. (c).
On applying reciprocity property to Fig. (c), we get circuit in Fig. (d).
Fig. (b) = Fig. (c) + Fig. (d)
i_{x 1}=i_{x 1}+i_{x 2}=8-4=4 A