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A magnetic field (sometimes called B-field [1]) is a physical field that describes the magnetic influence on moving electric charges, electric currents, [2]: ch1 [3] and magnetic materials. A moving charge in a magnetic field experiences a force perpendicular to its own velocity and to the magnetic field.
地磁场 （geomagnetic field）是从地心至磁层顶的空间范围内的磁场。地磁学的主要研究对象。人类对于地磁场存在的早期认识，来源于 天然磁石 和磁针的指极性。
9 Μαρ 2022 · A magnetic field is an invisible force field generated by a magnet (like bar magnet and horseshoe magnet), moving electric charge (like current-carrying wire, toroid, and solenoid), spinning electrons, and changing electric field.
A magnetic field is a vector field in the neighbourhood of a magnet, electric current, or changing electric field in which magnetic forces are observable. A magnetic field is produced by moving electric charges and intrinsic magnetic moments of elementary particles associated with a fundamental quantum property known as spin.
A magnetic field is generated by a feedback loop: Current loops generate magnetic fields (Ampère’s law); a changing magnetic field generates an electric field (Faraday’s law); and the electric and magnetic fields exert a force on the charges that are flowing in currents (the Lorentz force).
26 Οκτ 2024 · Magnetic field, a vector field in the neighborhood of a magnet, electric current, or changing electric field, in which magnetic forces are observable. Magnetic fields such as that of Earth cause magnetic compass needles and other permanent magnets to line up in the direction of the field.
磁场（英語： magnetic field ）是一向量場，其描述对于移动电荷、电流 [1] [2] 、磁性材料的磁影响（磁效应、磁作用）。 在磁场中移动的电荷会受到垂直于其自身速度和垂直于磁场的 力 [ 3 ] 。
The magnetic field created by an electric current in a long straight wire is shown in Figure 20.13. The magnetic field lines form concentric circles around the wire. The direction of the magnetic field can be determined using the right-hand rule. This rule shows up in several places in the study of electricity and magnetism.
Learn about and revise magnets, magnetic poles, magnetic fields, permanent and induced magnets with GCSE Bitesize Physics.
3 Αυγ 2021 · Launched in November 2013 by the European Space Agency (ESA), the three-satellite Swarm constellation is providing new insights into the workings of Earth’s global magnetic field. Generated by the motion of molten iron in Earth’s core, the magnetic field protects our planet from cosmic radiation and from the charged particles emitted by our Sun.
