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For ZL = ZS*, the relation between XL and XS is?

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For ZL  = ZS*, the relation between XL and XS is?

(a) XL = XS

(b) XL = 0

(c) XL = 1

(d) XL = -XS
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Correct choice is (d) XL = -XS

Easiest explanation: For ZL = ZS*, the relation between XL and XS is XL = -XS. Maximum power transfer is not always desirable since the transfer occurs at a 50 percent efficiency.
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If ZL = ZS*, then?
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