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Verified answer
Ro/l = 50 ohm/martinya setiap 50 Om panjangnya 1 meter
P = 400 W
V = 220 V
P = V . i
P = V . V/R
P = V^2/R
P . R = V^2
R = V^2/P
R = 220 . 220/40
R = 48400/40
R = 1210
jadi panjang yang yang dibutuhkan
l' = R/Ro/l = 1210/50 = 24,2 m