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Related Concept Videos

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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For a system of charges, it is easy to calculate the system's potential because potential is a scalar quantity. However, in some instances where calculating the electric field is more straightforward than finding the potential, the electric field is used to calculate the system's potential. For a positive charge, the electric field is radially outward, and the potential is positive at any finite distance from the positive charge. In such an electric field, the motion away from the...
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Equipotential Surfaces and Conductors01:16

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For a conductor in which all charges are at rest, the conductor's surface is equipotential. The electric field is always perpendicular to equipotential surfaces. Therefore, in a conductor with static charges, the electric field just outside the conductor is always perpendicular to the conductor's surface. Any tangential component of the electric field will cause charges to move inside the conductor, which will violate the electrostatic nature of the system. In an electrostatic...
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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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Van de Graaff generators (or Van de Graaffs) are devices used to demonstrate high voltage due to static electricity that can also be used for research. Robert Van de Graaff first built one in 1931 (based on original suggestions by Lord Kelvin) for use in nuclear physics research.
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When an electric field accelerates a free positive charge, it acquires kinetic energy. This process is analogous to an object being accelerated by a gravitational field as if the charge were going down an electrical hill where its electric potential energy is converted into kinetic energy, although, of course, the sources of the forces are very different. The electrostatic or Coulomb force acting on the positive test charge is conservative, which means that the work done on a test charge is...
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High Voltage Electric Fields Have Potential to Create New Physical Pest Control Systems.

Shin-Ichi Kusakari1, Kiyotsugu Okada2, Manabu Shibao2

  • 1Research Association of Electric Field Screen Supporters, Nara 631-8505, Japan.

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|July 19, 2020
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Summary

Electric fields can control pests by attracting or repelling them. This study developed an electric field screen to block airborne nuisances and demonstrated insect repulsion and destruction via electric discharge.

Keywords:
discharge-mediated positive electrificationelectric field avoidanceelectric field screeninsect-capturing functioninsect-repelling functionphysical control

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Area of Science:

  • Electrostatics
  • Pest Control Technology
  • Applied Physics

Background:

  • Electric fields surround electric charges and exert forces on other charges.
  • High voltage electric fields can induce electrostatic phenomena applicable to pest control.
  • Existing pest control methods may have limitations addressed by novel electric field applications.

Purpose of the Study:

  • To introduce an attractive force from surface charges on insulated conductors for pest control.
  • To develop an electric field screen for preventing airborne nuisances.
  • To investigate insect disinclination to enter electric fields and discharge-mediated insect destruction.

Main Methods:

  • Constructed an electric field screen utilizing attractive forces from surface charges.
  • Investigated the repulsive effect of electric fields on insects.
  • Analyzed discharge phenomena on non-insulated conductors for insect destruction.
  • Cited examples explaining attraction, dielectrophoretic spore movement, and insect electrification.

Main Results:

  • Successfully created an electric field screen that prevented airborne nuisances like spores, insects, and pollen.
  • Demonstrated that insects avoid entering the generated electric fields, providing a repellent effect.
  • Observed that electric discharge from non-insulated conductors could destroy exposed insects.

Conclusions:

  • Electric field screens are effective barriers against airborne biological and particulate nuisances.
  • Electric fields possess both repellent and attractive properties for pest management.
  • Electric discharge offers a potent method for insect elimination in pest control strategies.