# Circuit Theorems – 56

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56. Referring to the given circuit, find ZTH if VS is 18 ∠0° V.

(a) 9.82 ∠–51.3° kΩ
(b) 9.38 ∠–51.3° kΩ
(c) 180 ∠–38.3° kΩ
(d) 19.2 ∠–38.3° kΩ

Explanation
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