21. Jean Baptiste Biot: Biography And Much More From Answers.com With French physicist François Arago, Biot measured properties of gases, and withFrench physicist felix savart, he formulated a law for the magnetic force http://www.answers.com/topic/jean-baptiste-biot

showHide_TellMeAbout2('false'); Business Entertainment Games Health ... More... On this page: Scientist Encyclopedia Wikipedia Mentioned In Or search: - The Web - Images - News - Blogs - Shopping Jean Baptiste Biot Scientist Biot, Jean Baptiste Jean Baptiste Biot Library of Congress b. Paris, April 21, 1774, d. Paris, February 3, 1862] Biot was a physicist whose main discoveries affected astronomy, earth science, and chemistry. His 1803 report on a meteorite fall convinced scientists for the first time that rocks fall from the sky. His balloon flights with Joseph Louis Gay-Lussac established that Earth's magnetic field extends into the atmosphere. In 1815 Biot showed that some organic compounds have two chemically identical forms that rotate polarized light in different directions, correctly speculating that the effect is caused by differences in the shape of the molecules. Encyclopedia Biot, Jean Baptiste zh¤N b¤tēst byō ) , 1774–1862, French physicist, grad. ‰cole Polytechnique (1797). He taught mathematics at Beauvais before becoming (1800) professor of mathematical physics at the Coll¨ge de France and later (1809–49) of astronomy at the Sorbonne. With French physicist Fran§ois Arago , Biot measured properties of gases, and with French physicist Felix Savart, he formulated a law for the magnetic force near a wire carrying an electric current. He discovered that when light passes through some substances, including sugar solutions, the plane of polarization of the light is rotated by an amount that depends on the color of the light.

22. The Biot-Savart Law by a currentcarrying conductor, Jean Baptist Biot and felix savart reportedthat a conductor carrying a steady current exerts a force on a magnet. http://www.engineering.com/content/ContentDisplay?contentId=41004014

23. Biot-Savart-Gesetz - Wikipedia Translate this page Das Biot-savart-Gesetz beschreibt das Magnetfeld, das durch bewegte es nachden beiden französischen Mathematikern Jean Baptiste Biot und felix savart. http://de.wikipedia.org/wiki/Biot-Savart-Gesetz

Es ist geschafft - unser Spendenziel von 200.000$ ist erreicht . Herzlichen Dank an alle Spender. Biot-Savart-Gesetz aus Wikipedia, der freien Enzyklop¤die Das Biot-Savart-Gesetz beschreibt das Magnetfeld , das durch bewegte elektrische Ladungen erzeugt wird. Benannt wurde es nach den beiden franz¶sischen Mathematikern Jean Baptiste Biot und Felix Savart . Es stellt neben dem Gesetz ¼ber die Kraftwirkung magnetischer Felder auf bewegte elektrische Ladungen eines der beiden Grundgesetze der Magnetostatik dar, einem Teilgebiet der Elektrodynamik Danach erzeugt eine Punktladung Q , die sich am Ort mit der Geschwindigkeit bewegt, im SI-Einheitensystem ein Magnetfeld nach Dabei ist μ die Permeabilit¤t . F¼r elektrische Str¶me, die sich durch eine Ladungsstromdichte beschreiben lassen, ergibt sich das Volumenintegral F¼r das Magnetfeld eines linienf¶rmigen Leiters C , in dem der elektrische Strom I flieŸt, ergibt sich das Linienintegral Dabei ist ein infinitesimales Linienelement entlang des Leiters, und zwar in Richtung des elektrischen Stromes. F¼r eine parametrische Darstellung des Leiters ist durch zu ersetzen.

24. Savart's Cup And Resonator felix savart (17911841) is probably best known for his 1820 investigation (withBiot) of the strength of a magnetic field as a function of the geometry of http://physics.kenyon.edu/EarlyApparatus/Acoustics/Savarts_Cup/Savarts_Cup.html

Savart's Cup and Resonator Felix Savart (1791-1841) is probably best known for his 1820 investigation (with Biot) of the strength of a magnetic field as a function of the geometry of a wire and the current through it. But, most of his research dealt with acoustics, including the first explanation of the operation of a violin. The edge of the cup or bell of Savart's apparatus is set into oscillation with a violin bow to produce a sound of definite pitch. The sliding piston of the resonator is then moved in and out to give the maximum amplitude of sound. Note that the relatively large diameter of the resonator gives large end corrections; the wavelength of the resonant wavelength is larger than four times the interior depth. The Union apparatus is by the Paris firm of Lerebours et Secretan, and is listed at 400 francs in the 1853 catalogue. Amherst College Colby College Wittenberg University Union College St. Patrick's College, Maynooth, County Kildare, Ireland

25. The Biot-Savart Law Equation (337) is known as the Biotsavart law after the French physicists JeanBaptiste Biot and felix savart it completely specifies the magnetic field http://farside.ph.utexas.edu/teaching/em/lectures/node39.html

Next: Electrostatics and magnetostatics Up: Time-independent Maxwell equations Previous: The magnetic vector potential The Biot-Savart law According to Eq. ( ), we can obtain an expression for the electric field generated by stationary charges by taking minus the gradient of Eq. ( ). This yields which we recognize as Coulomb's law written for a continuous charge distribution. According to Eq. ( ), we can obtain an equivalent expression for the magnetic field generated by steady currents by taking the curl of Eq. ( ). This gives where use has been made of the vector identity . Equation ( ) is known as the Biot-Savart law after the French physicists Jean Baptiste Biot and Felix Savart: it completely specifies the magnetic field generated by a steady (but otherwise quite general) distributed current. Let us reduce our distributed current to an idealized zero thickness wire. We can do this by writing where is the vector current ( i.e. , its direction and magnitude specify the direction and magnitude of the current) and is an element of length along the wire. Equations (

26. The Biot-Savart Law Equation (3.150) is known as the ``Biotsavart law after the French physicistsJean Baptiste Biot and felix savart; it completely specifies the magnetic http://farside.ph.utexas.edu/teaching/em1/lectures/node36.html

Next: Electrostatics and magnetostatics Up: Maxwell's equations Previous: The magnetic vector potential The Biot-Savart law According to Eq. (3.133) we can obtain an expression for the electric field generated by stationary charges by taking minus the gradient of Eq. (3.148). This yields which we recognize as Coulomb's law written for a continuous charge distribution. According to Eq. (3.135) we can obtain an equivalent expression for the magnetic field generated by steady currents by taking the curl of Eq. (3.147). This gives where use has been made of the vector identity . Equation (3.150) is known as the ``Biot-Savart law'' after the French physicists Jean Baptiste Biot and Felix Savart; it completely specifies the magnetic field generated by a steady (but otherwise quite general) distributed current. Let us reduce our distributed current to an idealized zero thickness wire. We can do this by writing where is the vector current ( i.e. , its direction and magnitude specify the direction and magnitude of the current) and is an element of length along the wire. Equations (3.150) and (3.151) can be combined to give

27. Biot-Savart Law -- Facts, Info, And Encyclopedia Article felix savart (Attraction for iron; associated with electric currents as well asmagnets; characterized by fields of force) magnetism http://www.absoluteastronomy.com/encyclopedia/b/bi/biot-savart_law1.htm

Biot-Savart Law [Categories: Introductory physics, Electromagnetism] The Biot-Savart Law describes the (The lines of force surrounding a permanent magnet or a moving charged particle) magnetic field set up by a steadily flowing line current: the field produced by a current element is where is the magnetic constant I is the current, measured in (The basic unit of electric current adopted under the Systeme International d'Unites) ampere s is the unit displacement vector from the element to the field point Hence, integrating, the field produced by current flowing in a loop is The Biot-Savart law is fundamental to (Click link for more info and facts about magnetostatics) magnetostatics just as (Click link for more info and facts about Coulomb's law) Coulomb's law is to (The branch of physics that deals with static electricity) electrostatics . It is equivalent to (Click link for more info and facts about Ampère's law) Ampère's law The Biot-Savart law is also used to calculate the velocity induced by vortex lines in aerodynamic theory. (The theory is closely parallel to that of magnetostatics; vorticity corresponds to current, and induced velocity to magnetic field strength.) For an vortex line of infinite length, the induced velocity at a point is given by

28. Biot - Savart, Force Of (JeanBaptiste Biot, 1774-1862, and felix savart, 1791-1841, French physicists),force F which acts upon a current- carrying conductor in a magnetic field. http://www.amershamhealth.com/medcyclopaedia/medical/Volume I/BIOT SAVART FORC

financial services our commitment our company Search Medcyclopaedia for: Search marked text (mark text before you click) Browse entry words starting with: A B C D ... amershamhealth.com Biot - Savart, force of, (Jean-Baptiste Biot, 1774-1862, and Felix Savart, 1791-1841, French physicists), force F which acts upon a current- carrying conductor in a magnetic field. The force acting on an infinitesimal piece of conductor dl is proportional to the current times the vector product (see vector ) of the directional vector of the conductor of electricity and the magnetic induction (B) (I) (see magnetic field (H) dF = I[dl x B] GvS The Encyclopaedia of Medical Imaging Volume I Corporate Products Financial Services Our Commitment ... Terms of Conditions

29. History 1820 Jean-Baptiste Biot and felix savart show that the magnetic force exertedon a magnetic pole by a wire falls off like 1/r and is oriented http://maxwell.byu.edu/~spencerr/phys442/node4.html

Next: Review Sheet Up: No Title Previous: Homework Assignments History A Ridiculously Brief History of Electricity and Magnetism Mostly from E. T. Whittaker's A History of the Theories of Aether and Electricity... 900 BC - Magnus, a Greek shepherd, walks across a field of black stones which pull the iron nails out of his sandals and the iron tip from his shepherd's staff (authenticity not guaranteed). This region becomes known as Magnesia. 600 BC - Thales of Miletos rubs amber ( elektron in Greek) with cat fur and picks up bits of feathers. 1269 - Petrus Peregrinus of Picardy, Italy, discovers that natural spherical magnets (lodestones) align needles with lines of longitude pointing between two pole positions on the stone. 1600 - William Gilbert, court physician to Queen Elizabeth, discovers that the earth is a giant magnet just like one of the stones of Peregrinus, explaining how compasses work. He also discusses static electricity and invents an electric fluid which is liberated by rubbing. ca. 1620 - Niccolo Cabeo discovers that electricity can be repulsive as well as attractive.

30. CMH - Work With Saunders Saunders s reference to the important work of felix savart in a letter has alreadybeen noted, and he gave her other advice as well. http://www.catgutacoustical.org/PEOPLE/cmh/laird3.html

Carleen Maley Hutchins Work With Saunders In 1949, the same year that Hutchins began her study as a luthier, Helen Rice introduced her to Frederick A. Saunders (1875-1963), a retired Harvard physicist who had been conducting research on violin acoustics since the early 1930s. Best known for the Russell-Saunders coupling (a principle of atomic spectroscopy), Saunders had been chair of the physics department at Harvard, a fellow of the National Academy of Sciences, and one-time president of the Acoustical Society of America. An amateur violinist and violist, he tried her viola and said that he would look forward to seeing her next one. At that point, Hutchins insists, she had no intention of making another. After speaking with Saunders and reading some of his articles, Hutchins realized how she could help him: [FN 14] ...the only thing he'd ever been able to do was to work with musicians who came with the instruments as they were. He didn't dare change anything except to maybe take a little bit of wax and put a penny, or a little bit of weight on the bridge... What Hutchins offered was to build instruments on which Saunders could make actual changes, like the position and size of the f-holes or height of the ribs. Evidence of this joint work is found in the many surviving letters from Saunders to Hutchins.

31. Founding A Family Of Fiddles - Sec. 1 Ernst Chladni (1802), felix savart (1819) and Hermann LF Helmholtz (1880).savart, who can rightly be considered the grandfather of violin research, http://www.catgutacoustical.org/research/articles/fiddfam/fiddfam1.html

Founding a Family of Fiddles Catgut Acoustical Society Groundwork in the scientific investigation of the violin was laid by such men as Marin Mersenne (1636), Ernst Chladni (1802), Felix Savart (1819) and Hermann L. F. Helmholtz (1880). Savart, who can rightly be considered the grandfather of violin research, used many ingenious devices to explore the vibrational characteristics of the violin. But he was unable to gain sufficient knowledge of its complicated resonances to apply his ideas successfully to development and construction of new instruments. Recent research that has led to our new fiddle family is largely the work of Hermann Backhaus, Herman Meinel, Gioacchino Pasqualini, Ernst Rohloff, Werner Lottermoser and Frieder Eggers in Europe and of the late Frederick A. Saunders, John C. Schelleng, William Harvey Fletcher and myself in the United States. Among other accomplishments of our Catgut Acoustical Society is a concert played at Harvard last summer during the meeting of the Acoustical Society of America. It was dedicated to Saunders and the instruments were our eight new fiddles, which are the outgrowth of research he began. I write about the concert and about the instruments as a member of the society and as one who worked with Saunders from 1948 until his death in 1963. My activities include reconciliation of the wisdom of experienced musicians and violin makers, coordination of much technical information from widely separated sources, and design, construction and testing of experimental instruments. In 1937 Saunders reported

32. The Journal savart, felix (Verdon) 8/11326 Schenk, Otto Karl (Chapman) 4/2101-18. Serly,Tibor (Rosenblum) 4/2128. Shumsky, Oscar 1/33-4 http://www.vsa.to/subjectindex.htm

About the Journal Journals Published Selected Articles Subject Index ... Z A brams, Ray H. 6/2:1 Academic institutions, libraries, museums, etc. Brigham Young University, Primrose memorabilia collection (Dalton) 4/2:119-21 Curtis Institute of Music, tribute to Efrem Zimbalist (de Lancie, Shumsky, Webster, and Zimbalist, Jr.) 4/1:58-78 Library of Congress, string instrument collection (Mell) 5/2:138-66 Oberlin Conservatory, Goodkind collection dedication 9/2:187-200 Role in preserving string instruments (Hoover, Libin, and Rephann) 5/2:9-31 Saint Thomas University, Karon exhibition 4/1:141 Smithsonian Institution, violin and bow collection (Sturm) 5/2:75-102 University of South Dakota, Shrine to Music Museum, string instrument collection (Banks) 8/3:18-48 Accardo, Salvatore (Mell) 7/1:78-88 Acoustics and physics Bow hair (James) 3/1:5-12 Bowing (Pickering) 6/3:59-64 Bowing contact point, effect on tone (Pickering) 9/2:64-80 Characteristics of old violins (Caldersmith) 9/2:129-42 Electronic violin (Mathews) 8/1:71-88 Measurement of velocity of propagation of sound (Lucchi) 9/1:107-23 Plate graduation (Xu, Dixon, Bassett, and Strong) 9/3:145-62

33. Physics Lecture 15 - Sources Of Magnetic Fields two French scientists, Jean Biot and felix savart, worked out the relationship Note that implicit in the Biotsavart Law is the notion that magnetic http://dept.physics.upenn.edu/courses/gladney/phys151/lectures/lecture_feb_28_20

Chapter 8 Sources of Magnetic Field Magnetic Field of Moving Charges Magnetic Field for a Single Moving Charge In keeping with our previous statement about the association of charges acted upon by fields and the fields produced by those charges, it is only natural to think that, once it is established that magnetic fields act on moving electric charges, then moving electric charges should create magnetic fields. In fact, experiment shows just such a relationship! The symmetry inherent in nature between fields and charges is therefore upheld. We find that a single moving point charge q which has constant velocity v in a vacuum produces a magnetic field B m p q v r r Note the introduction of a new fundamental constant of nature, m , the permeability of free space . We define the value of m as being m p /C p So, if m is a constant of nature, why is it defined rather than measured as other constants have been? The reason lies in what was historically recognized as a curious relationship between the permittivity and the permeability of free space. Namely, their product is the inverse of the square of the speed of light, i.e. c e m The reason for this amazing correspondence will be explained later in the semester. For now, we take it that it is useful to define the value of c and hence after measuring

34. Hall Of Pioneers In 1820, with felix savart, he discovered the law known as Biot and savart s Law. He was especially interested in questions relating to the polarization http://www.seas.ucla.edu/jht/pioneers/pioneers.html

History of Heat Transfer Jean Baptiste Biot (1774-1862) Allan Philip Colburn (1904-1955) Baron Jean Baptiste Joseph Fourier (1768-1830) Leo Graetz (1856-1941) Leo Graetz was a German Physicist born at Breslau, Germany on September 26, 1856. He studied Mathematics and Physics at Breslau, Berlin and Strassburg. In 1881, he became the assistant to A. Kundt at Strassburg and in 1883 he went to the University of Munchen where he became a Professor in 1908 and occupied the Second Chair for Physics parallel to Roentgen. His scientific work was first concerned with the fields of heat conduction, radiation, friction and elasticity. After 1890, his work forcused upon problems of electromagnetic waves and cathode rays. Graetz was a prolific technical writer as evidenced by his twenty-three editions of book Electricity and Its Applications and a five volume work Handbook of Electricity and Magnetism. These works contributed to the wide dissemination of knowledge in electricity which, at their time of printing, was still in its infancy. He died in Munchen on November 12, 1941, at age 85. Franz Grashof (1826-1893) Max Jakob (1879-1955) The Max Jakob Memorial Award was created in 1961 to commemorate the outstanding contributions of this much admired pioneer. It is bestowed annually by ASME, to honor eminent achievement of distinguished service in the field of Heat Transfer

35. Science And The Stradivarius (April 2000) - Physics World - PhysicsWeb Vuillaume worked closely with felix savart, best known to physicists for theBiotsavart law in electromagnetism, to enhance the tone of early instruments. http://physicsweb.org/article/world/13/4/8

Advanced site search physics world sample issue Request a sample issue browse the archive January February March April May June July August September October November December Latest issue Subscribe to Physics World Media Information ... Editorial Staff quick search Search Physics World Physics World April 2000 Science and the Stradivarius Feature: April 2000 Colin Gough received the 2001 Science Writing Award for Professionals in Acoustics from the Acoustical Society of America for this article. Stradivarius violins are among the most sought-after musical instruments in the world. But is there a secret that makes a Stradivarius sound so good, and can modern violins match the wonderful tonal quality of this great Italian instrument? Is there really a lost secret that sets Stradivarius violins apart from the best instruments made today? After more than a hundred years of vigorous debate, this question remains highly contentious, provoking strongly held but divergent views among players, violin makers and scientists alike. All of the greatest violinists of modern times certainly believe it to be true, and invariably perform on violins by Stradivari or Guarneri in preference to modern instruments. The violin is the most highly developed and most sophisticated of all stringed instruments. It emerged in Northern Italy in about 1550, in a form that has remained essentially unchanged ever since. The famous Cremonese violin-making families of Amati, Stradivari and Guarneri formed a continuous line of succession that flourished from about 1600 to 1750, with skills being handed down from father to son and from master to apprentice. The popular belief is that their unsurpassed skills, together with the magical Stradivarius secret, were lost by the start of the 19th century.

36. Tiny Forces Create Shock Waves (November 1999) - Physics World - PhysicsWeb Such shocks were first studied by the French physicist felix savart as long agoas 1833, and are still an active area of research. http://physicsweb.org/articles/world/12/11/8/1

Advanced site search physics world sample issue Request a sample issue browse the archive January February March April May June July August September October November December Latest issue Subscribe to Physics World Media Information ... Editorial Staff quick search Search Physics World Physics World November 1999 Tiny forces create shock waves Physics in Action: November 1999 When a vertical jet of water from a tap or faucet hits the bottom of a sink, the water spreads out in a thin sheet. At a certain distance from the point where the water hits the sink, however, there is a sharp step. Beyond this step, the flow is thick and slow. This is a classical example of a shock in shallow water. Such shocks were first studied by the French physicist Felix Savart as long ago as 1833, and are still an active area of research. The wetting and dewetting of surfaces is important in many real-world applications. Examples include four-colour offset printing, road safety (hydroplaning is related to viscous dewetting) and agriculture. When a plant is sprayed with fungicide, for example, there is a tendency for the solution to form droplets on the leaves rather than completely wet them. This dewetting can be blocked by suitable additives in the fungicide solution. Phys. Rev. Lett

37. Holiday Inn Metz Technopole 2000 - Metz - Holiday Inn Metz Technopole 2000 Revie 1 Rue felixsavart Bp 5159 Ced Metz 57074 France. Deals on Metz hotels 1 Rue felix-savart Bp 5159 Ced, Metz 57074, France. Rooms 90 http://www.tripadvisor.com/Hotel_Review-g187164-d228000-Reviews-Holiday_Inn_Metz

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38. PhysicsWeb - Physics World Magazine Vuillaume worked closely with felix savart, best known to physicists for theBiot­savart law in electromagnetism, to enhance the tone of early instruments. http://www.pucp.edu.pe/~fisica/espec/articulos/stradivarius.htm

Author: Colin Gough Related links: Thinkquest: The history of the violin Violink: Database of violin resources Catgut acoustical society Further Reading Features : April 2000 Back to Volume 13 Issue 4 Article of 10 Science and the Stradivarius Stradivarius violins are among the most sought-after musical instruments in the world. But is there a secret that makes a Stradivarius sound so good, and can modern violins match the wonderful tonal quality of this great Italian instrument? Is there really a lost secret that sets Stradivarius violins apart from the best instruments made today? After more than a hundred years of vigorous debate, this question remains highly contentious, provoking strongly held but divergent views among players, violin makers and scientists alike. All of the greatest violinists of modern times certainly believe it to be true, and invariably perform on violins by Stradivari or Guarneri in preference to modern instruments. Violins by the great Italian makers are, of course, beautiful works of art in their own right, and are coveted by collectors as well as players. Particularly outstanding violins have reputedly changed hands for over a million pounds. In contrast, fine modern instruments typically cost about £10 000, while factory-made violins for beginners can be bought for under £100. Do such prices really reflect such large differences in quality?

39. J. Eggers: Drops of sizes had already been recognised 200 years ago by felix savart in Paris . It is the periodicity of the process savart uses to obtain a time http://www.maths.bris.ac.uk/alumni/drops.html

Skip main navigation Home Admissions Alumni ... Skip search Search Skip subnavigation Home History News ... Home / Alumni Drop formation The ubiquity of drops is beautifully illustrated by this picture of a dolphin, jumping out of the water of the New England aquarium in Boston - the spontaneous formation of drops is a generic feature of flows involving free surfaces. Harald Edgerton's photograph also gives an idea of the challenges involved in the description of free surface flows. The description of the flow shown in the picture would be far beyond the computational capabilities of present day computers. (and it is unlikely that this statement will have to be revised any time soon !) Instead, it is much more fruitful to focus on the individual events of drop separation, which form the essential building-blocks of the flow dynamics. Perhaps it is possible to gain some general insight into the dynamics of drop formation, independent of the particular circumstance under which the drop is formed, or of the type of fluid involved. It is the periodicity of the process Savart uses to obtain a time resolution that is far beyond that if his naked eye. Using an especially constructed apparatus, he observed the jet against the background of a moving tape, painted alternately black and white. This amounts to a periodic illumination of the jet, yielding a stationary picture, if its frequency corresponds to the frequency at which drops are formed.

40. Royal Society | About The Society | History Of Science | Biographies Of Fellows savart, felix. Proceedings 1841 No 50 pp 352354. Sawicki, Roman Mieczyslaw.Biographical Memoirs 1995 vol 41 pp 395-418, plate, by I Denholm and M Elliott http://www.royalsoc.ac.uk/page.asp?id=2382

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