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Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

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Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
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Plane Electromagnetic Waves II01:29

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Consider a plane wavefront traveling in position x-direction with a constant speed. This wavefront can be utilized to obtain the relationship between electric and magnetic fields with the help of Faraday's law.
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Biot-Savart Law: Problem-Solving00:59

Biot-Savart Law: Problem-Solving

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The magnitude and direction of a magnetic field created by a steady current can be calculated using the Biot-Savart law.
Consider a mobile phone battery bank as a source of steady current, which flows through the wire connected between the two. What is the magnitude of the magnetic field created by this current at a field point P?
To estimate the magnitude of the total magnetic field, we first consider a small current element of length dl, at a distance r from the field point. Now the following...
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Motional Emf01:22

Motional Emf

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Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into the...
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Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

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An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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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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Related Experiment Video

Updated: Jun 14, 2025

Building Langmuir Probes and Emissive Probes for Plasma Potential Measurements in Low Pressure, Low Temperature Plasmas
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Building Langmuir Probes and Emissive Probes for Plasma Potential Measurements in Low Pressure, Low Temperature Plasmas

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The E × B magnetized plasma device (EMPD).

Charles T Hooper1,2, Jenny R Smith3, Trenton R Brewer4

  • 1Assurance Technology Corporation, Carlisle, Massachusetts 01741, USA.

The Review of Scientific Instruments
|September 3, 2024
PubMed
Summary
This summary is machine-generated.

A new plasma device enables the study of dynamic plasma coupling in magnetized plasmas. Researchers investigated how cathode properties and magnetic fields influence plasma characteristics, paving the way for advanced plasma research.

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Area of Science:

  • Plasma Physics
  • Magnetohydrodynamics
  • Experimental Physics

Background:

  • Dynamic plasma coupling is crucial for understanding various astrophysical and technological phenomena.
  • Investigating plasma behavior in E × B-drifting magnetized environments requires specialized experimental setups.

Purpose of the Study:

  • To introduce and characterize a novel plasma device designed for studying dynamic plasma coupling.
  • To explore the influence of key operational parameters on plasma properties within the device.

Main Methods:

  • Development of a cylindrical plasma device with Helmholtz coils for magnetic field generation.
  • Utilizing a hollow cathode source to create a plasma interacting with a floating conductor, forming a Virtual Cathode Lightsaber (VCL).
  • Employing various diagnostics to measure plasma density, electric fields, and rotational velocities.

Main Results:

  • The VCL successfully generates two counter-streaming plasma populations, ideal for coupling studies.
  • Plasma density, radial electric field, and rotational velocity are demonstrably affected by cathode current-voltage characteristics and magnetic field strength.
  • The device provides a controlled environment for fundamental plasma physics investigations.

Conclusions:

  • The developed plasma device is a valuable tool for studying dynamic plasma coupling in magnetized plasmas.
  • The findings highlight the significant impact of operational parameters on plasma behavior, offering insights for future research and applications.