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相关概念视频

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...
Magnetic Field Lines01:19

Magnetic Field Lines

The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
Magnetic field lines follow several hard-and-fast rules:
Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and  the vector product of the length vector along the current element and the field due to the first conductor. According to the...
Magnetic Flux01:18

Magnetic Flux

The magnetic flux measures the number of magnetic field lines passing through a given surface area. The SI unit for magnetic flux is the weber (Wb). Magnetic flux is a scalar quantity. It depends on three factors: the strength of the magnetic field B, the area through which the field lines pass, and the relative orientation of the field with the surface area.
Suppose a surface is divided into elements of area dA. For each element, the component of the magnetic field that is normal to the...
Magnetic Force01:18

Magnetic Force

In addition to the electric forces between electric charges, moving electric charges exert magnetic forces on each other. A magnetic field is created by a moving charge or a group of moving charges known as the electric current. A magnetic force is experienced by a second current or moving charge in response to this magnetic field. Fundamentally, interactions between moving electrons in the atoms of two bodies produce magnetic forces between them.
The magnetic force acting on a moving charge...
Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.

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相关实验视频

Updated: Jun 30, 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

木星的磁场 木星的磁场. 磁层,以及与太阳风的相互作用:先11号

E J Smith, L Davis, D E Jones

    Science (New York, N.Y.)
    |May 2, 1975
    PubMed
    概括
    此摘要是机器生成的。

    探测器Pioneer 11的数据显示,木星的磁层是粗而动态的,与太阳风相互作用. 修订后的磁场模型显示,磁场比之前估计的更强,更不规则.

    更多相关视频

    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

    A 100 KW Class Applied-field Magnetoplasmadynamic Thruster
    11:47

    A 100 KW Class Applied-field Magnetoplasmadynamic Thruster

    Published on: December 22, 2018

    相关实验视频

    Last Updated: Jun 30, 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

    A 100 KW Class Applied-field Magnetoplasmadynamic Thruster
    11:47

    A 100 KW Class Applied-field Magnetoplasmadynamic Thruster

    Published on: December 22, 2018

    科学领域:

    • 行星科学 行星科学
    • 磁动力学是一种磁动力学.
    • 空间物理 空间物理

    背景情况:

    • 木星的磁层是一个复杂的区域,是由太阳风相互作用形成的.
    • 之前的任务,如先驱者10号,提供了对木星磁场的初步见解.

    研究的目的:

    • 通过使用先11向量磁力计,对木星的磁场进行精确的测量.
    • 为了研究木星磁层和太阳风之间的动态相互作用.
    • 为了完善木星内部磁场的现有模型.

    主要方法:

    • 利用Pioneer 11矢量磁计进行连续磁场测量.
    • 分析了来自行星间空间,木星磁层和近邻的数据.
    • 开发了一个修订的偏移双极模型 (6参数匹配) 并进行了球体波分析 (23参数).

    主要成果:

    • 确认了动态的太阳风相互作用,导致磁层大小的变化和像弓冲击这样的现象.
    • 观测到一个粗的磁层,有一个明确的界限,在外部区域有一个持久的南向磁场组成部分.
    • 确定了在白天磁层中存在电流板的明显证据.
    • 与开拓者10偏移二极管模型发现5%的差异,导致修订后的模型具有更大的二极管矩和复合场.
    • 在北半球和南半球,推断的最大表面场分别为14和11高斯.
    • 木星的行星场比地球的有点不规则.

    结论:

    • 开拓者11号的数据提供了对木星磁层及其与太阳风相互作用的更详细的了解.
    • 修订后的磁场模型为木星的内部磁场提供了更好的准确性.
    • 木星的磁层表现出复杂的动态和结构,与简单的磁盘模型不同.