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На рис. 25 изображены сечения трех прямолинейных бесконечно длинных проводников с током. Расстояние АВ=ВС=5см. Токи I1= I3 = I, I2 =4I. Определить точки на оси ОХ, в которых индукция магнитного поля равна нулю.
