IYPT 2002, Задачи на турнира — Задача 8. Charged sand

15th IYPT (2002)

Заглавие в източника

Source: iypt.org.ua, before Jan. 8, 2002
Selected at the Preparatory Seminar in Odessa on Oct. 11—14, 2001
Exemplary solutions for 2002 →

Условие

Fine, well-dried quartz sand is poured out of a short thin tube into a conical metallic vessel connected to an electrometer. Investigate the behaviour of the sand stream as the vessel fills up. What changes if the stream is lit by a UV-lamp?

Решение

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Оригинал в Архива: 2002.txt