電磁波基礎及應用沈建其講義chapter1introductory-wenkub
2022-11-06 16:44:01 本頁面
【正文】 y, optical fiber, etc. 概述 R Oscilloscope Switch Vs R Oscilloscope Metal Plates Vs (a) (b) 9 概述 The history of the EM ● In remote antiquity, Cang Jie(倉頡 ), invented the Chinese characters (see below), which reveal the meanings of electricity and magism. 雷擊是指一部分帶電的云層與另一部分帶異種電荷的云層，或者是帶電的云層對大地間迅猛的放電。 試卷為英文。由于十年來，課程 《 電磁波基礎及應用 》 內容一直在變革、任課老師也在不斷變更，且因學時關系及教材語言等因素，我們所講內容不一定與 謝處方、饒克謹 《 電磁場與電磁波 》 書 一致，但此書亦可供平時參考。尤其是，該書內容和公式齊備，將來在做研究工作時，可供案頭備查公式使用。要求用英文作答 , 但用中文作答，不扣分。 雷甩神鞭，打擊閃電。一日浮壞也。 12 概述 ● In , Greek philosopher and mathematician, Thales, discovered the electric phenomenon (amber rubs woolen cloth and can then pick up a piece of feather) ● , Gilbert repeated Thales’ experiment and denominated it as electricity. ● , Franklin introduced the concept of positive and negative charges. ● , a French scientist, Coulomb, studied the electrical field force systematically and discovered a law what we now call “Coulomb law”. Note: amber琥珀 。 Marie Amp232。 后者可以由電池（如化學電池等）產生，可以在金屬導體內部存在，驅動電荷運動形成電流，遵守 Ohm定律，穩(wěn)恒的電場形成穩(wěn)恒的電流。 ? 以上是不含時（ timeindependent）的理論，屬于庫侖，奧斯特，安培，歐姆等人的貢獻。前者是 Faraday的貢獻（電磁感應定律），后者是 Maxwell的貢獻（位移電流概念的提出）。 x y z I C Jack x? y? z? Q v Jill Jack: fixed in the first coordinate. The current loop produces a steady magic field that leads to a magic force acting on the moving charge. If the charge stops, the force vanishes. Thus, Jack draws conclusions that the force results from the magic field and that there is no electric field in his system. BvQF ??? ??16 x y z I C Jack x? y? z? Q v Jill Jill: fixed in the second coordinate, which moves at velocity v relative to the first one. She also measures/detects a force (with magnitude being proportional to Q). Jill concludes that
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