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In AC networks, maximum power is delivered when __________

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In AC networks, maximum power is delivered when  __________

(a) ZL*ZS*=0

(b) ZL+ZS*=1

(c) ZL=-ZS*

(d) ZL=ZS*

I have been asked this question in an international level competition.

The doubt is from Maximum Power Transfer and Superposition topic in chapter Techniques of Circuit Analysis of Electric Circuits

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Correct choice is (d) ZL=ZS*

Explanation: Max power is delivered when load impedance equals complex conjugate of the source impedance.

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