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v =125 V
P= V.i --> i = V/R
P = V²/ R --> R = V²/P
= 125²/ 300
= 125.125 / 300
= 5.25.5.25 / 3.2.5.2.5
= 625/ 12 Ω
L = R/ l
= 625/12 / 20
= 625 / 12.20
= 25.25 /12.4.5
= 5.25 / 48
= 125/48
= 2,6 m