Its given that the current in the first branch is 1A, R1=5 ohms and voltage is 100+j200 volts.Power is 5kw.
so we know that P=V*I so we get I as 10 - j20 Amp by substituting values.
Hence Z1 = 6.25 + j12.5 Ω
I 2 = - 6 - j20 Amp so then finally z2 will be −10.54+j1.83Ω
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