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L = 60m
S = 1mm^2 = 0,000001 m^2
opór właściwy miedzi ρ = 0,017
Szukane: U = ?; R = ?
R = ρ*(L/S)
R = 0,017 * (60/0,000001) =1020000 Ohm
I = q/t = 100C/10s = 10A
R = U/I
U = R * I = 1020000 Ohm * 10A = 10200000 V
Odp. Napięcie wynosiło 10200000 V