IYPT 2015, Задачи на турнира — Задача 4. Liquid Film Motor

Problems for the 28th IYPT 2015

Release

Released by the IOC on July 11th, 2014

Епиграф

“Would you tell me, please, which way I ought to walk from here?”
“That depends a good deal on where you want to get to,” said the Cat.
Lewis Carroll

Условие

Form a soap film on a flat frame. Put the film in an electric field parallel to the film surface and pass an electric current through the film. The film rotates in its plane. Investigate and explain the phenomenon.

Perspective sketch: a horizontal soap film with interference colours lies in a flat frame on a base plate between two vertical dark-blue capacitor plates; the plates are connected to a voltage source marked − and +, a second source marked − and + drives a current through the film, and a dashed vertical axis with a curved arrow shows the film rotating in its plane.

Решение

Внимание: Непълно решение

Това е открита изследователска задача — официални решения не се публикуват.

Автори

Authors: Alan Allinson, John Balcombe, Roderick Bloem, Artsiom Bury, Samuel Byland, Nikita Chernikov, Lars Gislén, Łukasz Gładczuk, Timotheus Hell, Mihály Hömöstrei, Stanislav Krasulin, Valentin Lobyshev, Ilya Martchenko, Reza Montazeri Namin, Stanisław Świdwiński, Boris Vavrík, Evgeny Yunosov.

Problem selection committee: John Balcombe, Samuel Byland, Ilya Martchenko.

Epigraph selected by Evgeny Yunosov.

Оригинал в Архива: 2015.pdf