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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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Induced Electric Fields: Applications01:27

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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...
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Magnetic Field Of A Current Loop01:16

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Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
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Magnetic Field Due to Two Straight Wires01:18

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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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Energy Stored In A Coaxial Cable01:31

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A coaxial cable consists of a central copper conductor used for transmitting signals, followed by an insulator shield, a metallic braided mesh that prevents signal interference, and a plastic layer that encases the entire assembly.
In the simplest form, a coaxial cable can be represented by two long hollow concentric cylinders in which the current flows in opposite directions. The magnetic field inside and outside the coaxial cable is determined by using Ampère's law. The magnetic...
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Magnetic Field Due To A Thin Straight Wire01:28

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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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Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors
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一个基于聚胺复合材料的电磁悬臂结构,用于智能电网的电流传感.

Zeynel Guler1,2, Nathan Jackson1,2,3

  • 1Department of Mechanical Engineering, University of New Mexico, Albuquerque, NM 87131, USA.

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概括
此摘要是机器生成的。

这项研究开发了一种使用聚胺 (PI) 进行能量收集和传感的全聚合物复合器件. 该PI/零电/电磁约束杆显示出有希望的结果,用于检测磁场和电流.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术纳米技术
  • 电气工程 电气工程

背景情况:

  • 聚胺 (PIs) 由于其热和机械性能,在微电子机械系统 (MEMS) 中至关重要.
  • 开发用于能源采集和传感的多功能复合材料仍然是关键的研究领域.

研究的目的:

  • 开发一种全新的多层,全聚合物复合材料电压磁器件.
  • 探索其作为磁场和电流的能量收割器或传感器的潜力.
  • 为了研究不同磁纳米粒子 (NdFeB,Terfenol-D) 和配置的性能.

主要方法:

  • 用聚胺矩阵制造四层复合器件的制造.
  • 纳入银纳米颗粒用于导电性,硫酸 (PZT) 用于压电性,NdFeB或Terfenol-D用于磁约束.
  • 开发用于低频操作的悬臂设计.
  • 对具有不同磁性阻力质量的装置进行比较,并探索一种全磁性阻力装置.

主要成果:

  • 聚胺/PZT悬臂与聚胺/NdFeB防质量展现出比聚胺/特尔醇-D版本更高的输出电压.
  • 一个全磁性约束性聚胺-特尔醇-D膜装置通过维拉里效应成功运行,没有压电层.
  • 复合器件显示了检测磁场和电流变化的潜力.

结论:

  • 新型全聚合物复合材料设备可以制造用于能源采集和传感应用.
  • 选择强磁性材料和设备配置会影响性能.
  • 这些设备为开发基于MEMS的磁场和电流传感器提供了一个有前途的途径.