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Заряженная частица, двигаясь перпендикулярно скрещенным под прямым углом электричес¬кому (Е = 400 кВ/м) и магнитному (В = 0,25 Тл) полям, не испытывает отклонения при определённой скорости. Определить эту скорость.
