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Электрон, ускоренный разностью потенциалов 6 кВ, влетает в однородное магнитное поле под углом 30° к направлению поля и начинает двигаться по винтовой линии. Магнитная индукция поля равна 130 мТл. Найдите шаг винтовой линии.
