E = q/(4π × ε × ε0 × r^2) = k × q/ε × r^2
εE × r^2 = k × q
q = εE × r^2/k = 5 × 140 × 0,09/9 × 10^9 = 700 × 10^-11 = 7 × 10^-9 Кл = 7 нКл
ответ : 7 нКл
E = q/(4π × ε × ε0 × r^2) = k × q/ε × r^2
εE × r^2 = k × q
q = εE × r^2/k = 5 × 140 × 0,09/9 × 10^9 = 700 × 10^-11 = 7 × 10^-9 Кл = 7 нКл
ответ : 7 нКл