Question: A coil with inductance L = 0.70H and active resistance r = 20 is connected in series with an inductance-free resistance R. An alternating voltage

A coil with inductance L = 0.70H and active resistance r = 20Ω is connected in series with an inductance-free resistance R. An alternating voltage with effective value V = 220 V and frequency w = 314 s-1 is applied across the terminals of this circuit. At what value of the resistance R will the maximum heat power be generated in the circuit? What is it equal to?

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