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11.10 The circuit shown in Fig. P11.10 uses a 12-V ac source to deliver power to an 8-Ω speaker. If the average power delivered to the speaker is 1.8 W at an audio frequency f= 1 kHz, what is the value of the coupling coefficient k? 4Ω 12 cos 2z/t (V) 3mH 12 mH 8Ω Figure P11.10: Circuit for Problem 11.10.

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