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The value of ZTh in the circuit shown below is?(a) Z3+(Z1Z2/(Z1+Z2))(b) Z1+(Z3Z2/(Z3+Z2))(c) Z2+(Z1Z3/(Z1+Z3))(d) (Z1Z2/(Z1+Z2))I had been asked this question in an international level competition.This interesting question is from Thevenin’s Theorem topic in section Steady State AC Analysis of Network Theory

Answer» CORRECT OPTION is (a) Z3+(Z1Z2/(Z1+Z2))

To explain I would say: The thevenin’s equivalent form of any complex IMPEDANCE consists of an equivalent voltage SOURCE and an equivalent impedance. The thevenin’s impedance is ZTh = Z3+(Z1Z2/(Z1+Z2)).


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