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相关概念视频

Magnetism01:30

Magnetism

Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
Magnetic Fields01:27

Magnetic Fields

A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
Magnetic Damping01:17

Magnetic Damping

Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
Magnetic Declination01:19

Magnetic Declination

Magnetic declination is the angle between true north, which aligns with the Earth's rotational axis, and magnetic north, which follows the direction of the Earth's magnetic field. This discrepancy exists because the magnetic poles do not coincide with the geographic poles. The value of magnetic declination depends on the observer's location on Earth and is subject to changes over time due to the dynamic nature of the Earth's magnetic field.The declination is called eastern when magnetic north...

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相关实验视频

Updated: Jun 24, 2026

Geomagnetic Field (Gmf) and Plant Evolution: Investigating the Effects of Gmf Reversal on Arabidopsis thaliana Development and Gene Expression
11:04

Geomagnetic Field (Gmf) and Plant Evolution: Investigating the Effects of Gmf Reversal on Arabidopsis thaliana Development and Gene Expression

Published on: December 1, 2015

太平洋地磁场的世俗变化.

R R Doell, A Cox

    Science (New York, N.Y.)
    |January 22, 1971
    PubMed
    概括
    此摘要是机器生成的。

    地磁性世俗变化记录显示,在过去的0.7百万年里,太平洋中部的非双极场变弱了. 这表明下层地幔的不均性影响了这个区域下方的地球磁场产生.

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    相关实验视频

    Last Updated: Jun 24, 2026

    Geomagnetic Field (Gmf) and Plant Evolution: Investigating the Effects of Gmf Reversal on Arabidopsis thaliana Development and Gene Expression
    11:04

    Geomagnetic Field (Gmf) and Plant Evolution: Investigating the Effects of Gmf Reversal on Arabidopsis thaliana Development and Gene Expression

    Published on: December 1, 2015

    Enhancement of the Initial Growth Rate of Agricultural Plants by Using Static Magnetic Fields
    05:17

    Enhancement of the Initial Growth Rate of Agricultural Plants by Using Static Magnetic Fields

    Published on: July 8, 2016

    Assessing the Influence of Personality on Sensitivity to Magnetic Fields in Zebrafish
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    科学领域:

    • 地质物理学 地质物理学
    • 地球科学 地球科学 地球科学
    • 古磁力学是一种古磁学.

    背景情况:

    • 地球的磁场呈现世俗变化,其强度和方向的长期变化.
    • 地磁场的非双极成分被认为起源于地球核心内的复杂流体运动.
    • 之前的研究表明地磁场的区域差异,但根本原因仍在争论中.

    研究的目的:

    • 通过使用各种古磁和直接观测数据,研究长期地磁世俗变化.
    • 确定太平洋中部地区在地质时间尺度上的地磁场行为是否表现出独特的特征.
    • 为了确定下层地幔结构与非双极地磁场的抑制之间的潜在联系.

    主要方法:

    • 对地磁性世俗变化的直接观测站测量的分析.
    • 对夏威夷岩流的古磁分析具有精确的年龄 (0-200年).
    • 对夏威夷岩流的古磁分析,年龄不太精确 (200-10,000年).
    • 在过去的0.7百万年里,研究了来自岩流的全球古磁数据,以评估地磁角度分散.

    主要成果:

    • 所有分析的磁记录始终显示,与其他地区相比,太平洋中部的地球磁场的非双极成分减少了.
    • 这种观察到的模式在过去的070万年里一直存在,反映了当代场的特征.
    • 数据表明,地球的核心和下层地幔之间存在合,抑制了太平洋中部下方的非双极场的产生.

    结论:

    • 太平洋中部地区经历了一个被抑制的非双极地磁场,可能是由于下层地幔不均.
    • 观察到的模式表明,地球深层结构对产生地磁场的过程有显著的影响.
    • 需要进一步的研究来区分核心-地幔边界地形和下层地幔属性的横向变化作为主要原因.