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Related Concept Videos

Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

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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 Fields01:27

Magnetic Fields

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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.
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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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Induced Electric Fields01:23

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The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
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Energy In A Magnetic Field01:24

Energy In A Magnetic Field

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If a magnetic field is sustained, there must be a current in a closed circuit or loop, implying some energy has been spent in creating the field. If this energy is not dissipated via the circuit's resistance, it is stored in the field.
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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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Related Experiment Video

Updated: Dec 30, 2025

Remote Magnetic Navigation for Accurate, Real-time Catheter Positioning and Ablation in Cardiac Electrophysiology Procedures
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Ablation in Externally Applied Electric and Magnetic Fields.

Jovan Maksimovic1, Soon-Hock Ng1,2, Tomas Katkus1

  • 1Center for Micro-Photonics, Swinburne University of Technology, John Street, Hawthorn, VIC 3122, Australia.

Nanomaterials (Basel, Switzerland)
|January 25, 2020
PubMed
Summary

External electric and magnetic fields control laser ablation of silicon and glass via the Lorentz force. This method influences debris deposition and ripple formation, offering new nano-/micro-scale light-matter interaction control tools.

Keywords:
ablationdebriselectric fieldfemtosecond laser fabricationmagnetic fieldnear-edge X-ray absorption fine structure (NEXAFS)silicon

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Area of Science:

  • Materials Science
  • Laser Physics
  • Nanotechnology

Background:

  • Controlling light-matter interactions at the nano-/micro-scale requires advanced manipulation tools.
  • Laser ablation is a key process for material modification, but precise control remains challenging.

Purpose of the Study:

  • To investigate the control of laser ablation using external electric and magnetic fields.
  • To explore the application of the Lorentz force for manipulating laser-induced material modification.

Main Methods:

  • Ultra-short (sub-1 picosecond) laser pulses were used for ablation of silicon (Si) and glass.
  • An external electric field was applied using micro-electrodes during laser ablation.
  • An external magnetic field was applied in various configurations during Si ablation.

Main Results:

  • Laser ablation debris deposition was directed towards the negative electrode for both glass and Si.
  • The Lorentz force (F = e E + e [v × B]) was identified as the controlling mechanism.
  • Applied magnetic fields influenced the formation of ripples on the ablated Si surface.

Conclusions:

  • External electric and magnetic fields provide effective control over laser ablation processes.
  • This technique offers a novel method for directing debris and modifying surface structures at the micro-scale.
  • The findings enable enhanced control over light-matter interactions for advanced material processing.