翻訳と辞書 Words near each other ・ Helmeted myna ・ Helmeted pygmy tyrant ・ Helmeted water toad ・ Helmeted woodpecker ・ Helmetia ・ Helmets for Peace ・ Helmetshrike ・ Helmetta, New Jersey ・ Helmhaus Hotel ・ Helmholtz (disambiguation) ・ Helmholtz (lunar crater) ・ Helmholtz (Martian crater) ・ Helmholtz Association of German Research Centres ・ Helmholtz Centre for Environmental Research ・ Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences ・ Helmholtz coil ・ Helmholtz decomposition ・ Helmholtz equation ・ Helmholtz flow ・ Helmholtz free energy ・ Helmholtz Graduate School Environmental Health ・ Helmholtz Institute Jena ・ Helmholtz machine ・ Helmholtz pitch notation ・ Helmholtz reciprocity ・ Helmholtz resonance ・ Helmholtz theorem ・ Helmholtz theorem (classical mechanics) ・ Helmholtz Zentrum München ・ Helmholtz's theorems Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Helmholtz coil ： ウィキペディア英語版 Helmholtz coil A Helmholtz coil is a device for producing a region of nearly uniform magnetic field, named after the German physicist Hermann von Helmholtz. It consists of two solenoid electromagnets on the same axis. Besides creating magnetic fields, Helmholtz coils are also used in scientific apparatus to cancel external magnetic fields, such as the Earth's magnetic field. == Description == A Helmholtz pair consists of two identical circular magnetic coils (solenoids) that are placed symmetrically along a common axis, one on each side of the experimental area, and separated by a distance $h$ equal to the radius $R$ of the coil. Each coil carries an equal electric current in the same direction. Setting $h=R$, which is what defines a Helmholtz pair, minimizes the nonuniformity of the field at the center of the coils, in the sense of setting $\backslash partial^B/\backslash partial\; x^\; =\; 0$〔(Helmholtz Coil in CGS units )〕 (meaning that the first nonzero derivative is $\backslash partial^B/\backslash partial\; x^$ as explained below), but leaves about 7% variation in field strength between the center and the planes of the coils. A slightly larger value of $h$ reduces the difference in field between the center and the planes of the coils, at the expense of worsening the field's uniformity in the region near the center, as measured by $\backslash partial^B/\backslash partial\; x^$.〔(Electromagnetism )〕 In some applications, a Helmholtz coil is used to cancel out the Earth's magnetic field, producing a region with a magnetic field intensity much closer to zero.〔("Earth Field Magnetometer: Helmholtz coil" ) by Richard Wotiz 2004〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Helmholtz coil」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.