Question: A solenoid with inductance L = 7 mH and active resistance R = 44 is first connected to a source of direct voltage Vo and

A solenoid with inductance L = 7 mH and active resistance R = 44Ω is first connected to a source of direct voltage Vo and then to a source of sinusoidal voltage with effective value V = Vo. At what frequency of the oscillator will the power consumed by the solenoid be η = 5.0 times less than in the former case?

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