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A coil with inductance L=0.70 H and acti...

A coil with inductance `L=0.70 H` and active resistance `r=20 Omega` is connected in series with an inductance `-` free resistance `R`. An alternating voltage with effective value `V=220 V` and frequency `omega=314 s^(-1)` is a 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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