30 sources of the magnetic field tủ tài liệu bách khoa
➤ Gửi thông báo lỗi ⚠️ Báo cáo tài liệu vi phạmNội dung chi tiết: 30 sources of the magnetic field tủ tài liệu bách khoa
30 sources of the magnetic field tủ tài liệu bách khoa
All three of these commonplace items use magnetism to store information. The cassette can store more than an hour of music, the floppy drill can hold 30 sources of the magnetic field tủ tài liệu bách khoa the equivalent of hundreds of pages of information. and many hours of television programming cen be recorded on the videotape How do these devices work? tGecrye Sompfo)Sources of the Magnetic Fieldchapter30Chapter Outline30.1The Biot-Savart Law30.2The Magnetic Force Between Two Parallel Conductors3 30 sources of the magnetic field tủ tài liệu bách khoa0.3Ampere's Law30.4The Magnetic Field of a Solenoid30.5Magnetic Flux30.6Gauss's Law in Magnetism30.7Displacement Current and the General Form of Amper30 sources of the magnetic field tủ tài liệu bách khoa
e's Law30.8(Optional) Magnetism in Matter30.9(Optional) The Magnetic Field of the Earth937938CHAPĨÍR 30 Sources of the Magnetic field/' n the precedinAll three of these commonplace items use magnetism to store information. The cassette can store more than an hour of music, the floppy drill can hold 30 sources of the magnetic field tủ tài liệu bách khoaaction, this chapter deals with the origin of the magnetic field — moving charges. We begin by showing how to use the law of Biol and Savart to calculate the magnetic field produced at some point in space by a small current element. Using this formalism and the principle of superposition, we then ca 30 sources of the magnetic field tủ tài liệu bách khoalculate the total magnetic field due to various current distributions. Next, we show how to determine the force between two current-earning conductors30 sources of the magnetic field tủ tài liệu bách khoa
, which leads to the definition of the ampere. We also introduce Ampere's law. which is useful in calculating the magnetic field of a highly symmetricAll three of these commonplace items use magnetism to store information. The cassette can store more than an hour of music, the floppy drill can hold 30 sources of the magnetic field tủ tài liệu bách khoacts in matter can be explained on the basis of atomic magnetic moments, which arise both from the orbital motion of the electrons and from an intrinsic property of the electrons known as spin.Properties of the magiH'tic field created by an electric current30.1^ THE BIOT-SAVART LAWShortly after Oerst 30 sources of the magnetic field tủ tài liệu bách khoaed's discovery in 1819 that a compass needle is deflected by a current-carrying conductor, Jean-Baptiste Biot (1774-1862) and Felix Savart (1791-1841)30 sources of the magnetic field tủ tài liệu bách khoa
performed quantitative experiments on the force exerted by an electric current on a nearby magnet. From their experimental results. Biot and Savart aAll three of these commonplace items use magnetism to store information. The cassette can store more than an hour of music, the floppy drill can hold 30 sources of the magnetic field tủ tài liệu bách khoasion is based <>n the following experimental observations for the magnetic field dB at a point passociated with a length clement ds of a wire carrying a steady current / (Fig. 30.1):•The vector dB is perpendicular both to ds (which points in the direction of the current) and to the unit vector r dir 30 sources of the magnetic field tủ tài liệu bách khoaected from ds to p.•The magnitude of dB is inversely proportional to r2, where r is the distance from ds to p.•The magnitude OÍ dB Is proportional to30 sources of the magnetic field tủ tài liệu bách khoa
the current and to the magnitude ds of the length element ds.•The magnitude of dB is proportional to sin 0, where 0 is the angle between the vectors dAll three of these commonplace items use magnetism to store information. The cassette can store more than an hour of music, the floppy drill can hold 30 sources of the magnetic field tủ tài liệu bách khoalaw. The direction of the field is out of the page at /’and into the page at /*’. (b) The cross product ds X r points out of the page when r points toward p (c) The cross product ds X r points into the page when r points toward p.30.1The Biot-Sovart LawThese observations arc summarized in the mathem 30 sources of the magnetic field tủ tài liệu bách khoaatical formula known today as the Biot-Savart law:939All three of these commonplace items use magnetism to store information. The cassette can store more than an hour of music, the floppy drill can hold All three of these commonplace items use magnetism to store information. The cassette can store more than an hour of music, the floppy drill can holdGọi ngay
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