IYPT 1998, Задачи на турнира — Задача 11. Current system
11th IYPT (1998)
Заглавие в източника
Sources: Official version 97/10/15, Prouza 10-20-1997, Školská fyzika, 1996/1997, 3, 71—72, Vlado Koutny ca. 1999
Selected at the Preparatory Seminar in Germany on Oct. 15, 1997
Exemplary solutions for 1998 →
Условие
In a Petri dish (shallow bowl), small metal balls, e.g., 2 mm in diameter, are immersed in a layer of castor oil. The inner rim of the dish contains an earthed metal ring. Above the centre of the dish there is a metal needle which does not touch the oil surface. Investigate what happens when the voltage between needle and earth is about 20 kV. Warning: The high voltage should be obtained by means of a safe generator, e.g., an electrostatic generator!
Решение
Внимание: Непълно решение
В архива няма официално решение на тази задача.
Оригинал в Архива: 1998.txt