Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
유전율은 전기장과 전하의 관계를 설명합니다.Yujeon-yureun jeongi-jang-gwa jeonhwa-ui gwangye-reul seolmyeonghamnida.Permittivity explains the relationship between electric fields and charges.