[理化生]磁場與電磁感應(yīng)(已修改)
2025-03-02 17:08 本頁面
【正文】 第七章 磁場與電磁感應(yīng) 167。 71 磁場 磁感應(yīng)強(qiáng)度 167。 72 磁場對運(yùn)動電荷的作用力 167。 73 磁場對載流導(dǎo)線的作用 167。 74 物質(zhì)的磁性 167。 75 電磁感應(yīng) 167。 76 電磁場理論 Medical induction coil from the eighteenth century. This quack device was used to give a patient therapeutic electric shocks. At the time, these were believed to cure a number of ailments. 第七章 磁場與電磁感應(yīng) 167。 75 電磁感應(yīng) ( Electromagic induction ) Michael Faraday (17911867), British chemist and physicist. Faraday39。s major work was in the areas of magism and electricity, where he suggested the concepts of electric and magic fields. He did early work on the electric motor (1821), and induction, transformers and the dynamo (all 1831). He also gave lectures at the Royal Institution, London, that popularized science with the public. 第七章 磁場與電磁感應(yīng) Induced current. Two students preparing apparatus for inducing current in a coil. They are about to drop a mag through the coil. An oscilloscope attached to this will measure the changes in current. Electricity is generated, or induced, when a wire moves through a magic field. This principle is exploited in electricity generators, which spin a coil between mags to convert rotary motion into electrical energy. 第七章 磁場與電磁感應(yīng) + + + + Ua Ub 電源及其電動勢 僅有靜電場力不能維持穩(wěn)恒電流 .要維持穩(wěn)恒電流 ,除靜電力之外還必須存在 非靜電場力 . ? 電源外部 靠 靜電力作 用 使電荷運(yùn)動 . ? 電源內(nèi)部 靠 非靜電力 克服靜電力作用使電荷運(yùn)動 . ? 電源 :提供非靜電力的裝置 電源 ? Fk I E E 電池 化學(xué)作用 發(fā)電機(jī) 電磁感應(yīng) 光電池 光電效應(yīng) 第七章 磁場與電磁
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