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Кольцо из проволоки радиусом R = 15 см несет заряд q = 10 нКл. Определите напряженность E электрического поля в точках, расположенных от центра кольца на расстояниях x, равных 0, 5, 7, 10, 13, 15 см. Постройте график E = f(x).
