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相关概念视频

Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

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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...
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Magnetic Force On Current-Carrying Wires: Example01:22

Magnetic 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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Force On A Current Loop In A Magnetic Field01:17

Force On A Current Loop In A Magnetic Field

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Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process,...
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Magnetic Force On A Current-Carrying Conductor01:25

Magnetic Force On A Current-Carrying Conductor

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Moving charges experience a force in a magnetic field. Since the magnetic fields produced by moving charges are proportional to the current, a conductor carrying a current creates a magnetic field around it.
Consider a compass placed near a current-carrying wire. The wire experiences a force that aligns the needle of the compass tangentially around the wire. Thus, the current-carrying wire produces concentric circular loops of magnetic field. The magnetic field generated by a wire can be...
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Stokes' Law01:20

Stokes' Law

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Viscous forces, like friction, are intermolecular forces that resist the relative motion of molecules over each other. When a solid body moves through a liquid, viscous forces drag it in the opposite direction. The force's magnitude depends on the solid's shape and size, as well as its speed and the liquid's coefficient of viscosity, density and temperature.
The expression for the force on a solid spherical object in a fluid is called Stokes' law. Stokes' law is valid only...
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Viscosity of Fluid01:19

Viscosity of Fluid

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Viscosity measures the resistance a fluid offers to flow and deformation. It results from internal friction between layers of fluid moving relative to one another. Dynamic viscosity, denoted by the Greek letter mu (μ), quantifies the force needed to move one fluid layer over another. For Newtonian fluids like water and air, the relationship between the shearing stress and the rate of shearing strain is linear, meaning their viscosity remains constant regardless of the applied stress.
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Updated: Jun 18, 2025

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
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粘性电流诱导的力量

Vladimir U Nazarov1, Tchavdar N Todorov2, E K U Gross1

  • 1Fritz Haber Research Center of Molecular Dynamics, <a href="https://ror.org/03qxff017">The Hebrew University of Jerusalem</a>, Institute of Chemistry, Israel.

Physical review letters
|July 29, 2024
PubMed
概括
此摘要是机器生成的。

我们研究了电子液体中二原子杂质在电流下的运动. 这项研究揭示了合的核和质量中心运动,受到电子风和摩擦的影响,动态交换-关联效应显著.

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科学领域:

  • 凝聚物质物理学 凝聚物质物理学
  • 量子化学 是一个量子化学.
  • 材料科学 材料科学 材料科学

背景情况:

  • 电子液体中的二原子杂质会经历来自电子电流的力.
  • 了解这些力量对于预测杂质动态和材料特性至关重要.

研究的目的:

  • 为了研究在电子电流下在电子液体中的二原子杂质的转换,振动和旋转运动.
  • 分析电流诱导力 (电子风) 和电子摩擦之间的相互作用.
  • 阐明动态交换相关效应对杂质运动的作用.

主要方法:

  • 线性响应时间依赖密度函数理论 (TDDFT).
  • 埃伦费斯特的动力学模拟.
  • 一个线性代数方程系统的解.

主要成果:

  • 通过电子液体介导的质量中心和内部核运动之间的鉴定合.
  • 观察到三种不同的运动阶段:加速,稳定和减速.
  • 量化了动态交换相关核对力显著贡献,特别是在较低的电子密度下 (在旋转状态下,Cs密度高达40%).

结论:

  • 电子液体中二原子杂质的运动是复杂的,涉及结合的自由度.
  • 电子摩擦和电流诱导的力量决定了动态反应.
  • 动态交换关联效应在准确描述杂质动态方面发挥着至关重要的作用,特别是在较低的金属密度下.