相关概念视频
01:18Magnetic Field Due to Two Straight Wires
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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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01:28Magnetic Field Due To A Thin Straight Wire
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Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
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01:22Magnetic Force On Current-Carrying Wires: Example
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In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
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01:17Theory of Metallic Conduction
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The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
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01:21Current Density
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The total amount of current flowing through one unit value of a cross-sectional area is referred to as current density. If the current flow is uniform, the amount of current flowing through a conductor is the same at all points along the conductor, even if the conductor area varies. The current density consists of the local magnitude and direction of the charge flow, which varies from point to point. Current density is measured in amperes per meter square, and direction is defined as the net...
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01:15Charging Conductors By Induction
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The Earth is a good conductor of electricity, and it is so big that it can be considered an infinite source or sink of charges. It can easily exchange charges with any matter.
Generally, conductors like metals do not allow any excess charge to be present on them. Any excess charge added to metals easily flows away, for example, when a metal is placed on the Earth. This process is called earthing.
However, conductors can be charged by a process called induction. For example, consider charging a...
Generally, conductors like metals do not allow any excess charge to be present on them. Any excess charge added to metals easily flows away, for example, when a metal is placed on the Earth. This process is called earthing.
However, conductors can be charged by a process called induction. For example, consider charging a...
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相关实验视频
Updated: May 26, 2025
09:00
Evaluating Plasmonic Transport in Current-carrying Silver Nanowires
Published on: December 11, 2013
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在元电线中非局部导电.
Julio Andrés Iglesias Martínez1,2, Yi Chen1,2, Ke Wang2
1Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), 76128, Karlsruhe, Germany.
Advanced materials (Deerfield Beach, Fla.)
|February 21, 2025
概括
这项研究探讨了非局部电导,揭示了变长的元电线电阻中复杂的振荡行为,与传统的欧姆电导不同.
科学领域:
- 物理 物理学 物理
- 材料科学 材料科学 材料科学
- 电气工程 电气工程
背景情况:
- 欧姆定律描述了当地的导电,其中电流密度仅取决于同一位置的电场.
- 传统的导体具有与长度直接成比例的电阻.
- 非局部介质的电流密度取决于多个位置的电场.
研究的目的:
- 在理论和实验上研究导电非局部架构.
- 为了探索不同长度的元电线的导电特性.
- 了解工程结构中非局部导电的基本机制.
主要方法:
- 非局部电导的理论建模.
- 实验性制造和特征化超线结构.
- 在非局部介质中分析电流密度和电场关系.
主要成果:
- 证明了作为长度函数的元电线电阻的复杂振荡行为.
- 确定了与应用场相反的局部电流作为振荡的原因.
- 在非局部导电架构中确定了欧姆定律的偏差.
结论:
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