Прочитайте текст и определите какой из заголовков соответствует тексту It was found that if a sealin...: ответ на тест 781303 - Английский язык

Прочитайте текст и определите, какой из заголовков соответствует тексту
It was found that if a sealing-wax rod is rubbed with a woolen cloth, and a rod of glass is rubbed with a silken cloth, an electric spark will pass between the sealing-wax rod and the glass rod when they are brought near one another. Moreover, it was found that a force of attraction operates between them. An electrified sealing-wax is repelled, however, by a wax rod, and also an electrified glass rod is repelled, by a similar glass rod.