[理化生]磁場(chǎng)與電磁感應(yīng)-wenkub.com
2025-02-15 17:08 本頁(yè)面
【正文】 L n V B n I???? 磁場(chǎng)能量密度 BHHBw2121222m ??? ?? 磁場(chǎng)能量 ?? ?? VV VBVwW d2d2mm ?VwVBnBVnLIW m2222m 21)(2121 ???????第七章 磁場(chǎng)與電磁感應(yīng) ?rIHRrRπ2,21 ???0,2 ?? HRr0,1 ?? HRr例 78： 同軸電纜 中金屬芯線的半徑為 ，共軸金屬圓筒的半徑為 ，中間充 以磁介質(zhì)（磁導(dǎo)率為 ） ,現(xiàn)將芯線和 圓筒分別和電池兩極相接， 若金屬芯線內(nèi)的磁場(chǎng)可略去 ，求此同軸電纜芯線與圓筒間單位長(zhǎng)度上的磁能和自感 . 1R?2R解 H 的安培環(huán)路定理 0dLLH l I?? ??內(nèi)2Rr第七章 磁場(chǎng)與電磁感應(yīng) ?21 RrR ??2mm 22dd 8 πVVIW w V Vr??? ????2Rrdr單位長(zhǎng)度殼層體積 1dπ2d ?? rrV212m d4 πRRIWrr?? ??? 122lnπ4 RRI??2m 21 LIW ?21 ()22 πIr??222π8 rI??2m 21 Hw ??12lnπ2 RRL ??第七章 磁場(chǎng)與電磁感應(yīng) 磁場(chǎng) 高斯定理 磁場(chǎng) 環(huán)路定理 電場(chǎng) 環(huán)路定理 電場(chǎng) 高斯定理 dSSq?? ??? DS內(nèi)d0S???? ΒSdLLI?? ?? Hl內(nèi)167。 75 電磁感應(yīng) ( Electromagic induction ) Michael Faraday (17911867), British chemist and physicist. Faraday39。 73 磁場(chǎng)對(duì)載流導(dǎo)線的作用 167。第七章 磁場(chǎng)與電磁感應(yīng) 167。 74 物質(zhì)的磁性 167。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(chǎng)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 princi
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