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Electric Charges

Electric Charges

From lightning during thunderstorms to electronic devices, the phenomenon of electromagnetism is all around us. The electromagnetic force is one of the four fundamental forces of nature. It has been known to humanity in various forms for thousands of years. For example, the ancient Greek philosopher Thales of Miletus recorded his experiments on static electricity using amber and fur in the sixth century BC.
The English physicist William Gilbert studied the phenomenon of static electricity in...

Equipotential Surfaces and Conductors

Equipotential Surfaces and Conductors

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...

Van de Graaff Generator

Van de Graaff Generator

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Electrostatic Boundary Conditions

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Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
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Electric fields generated by static charges, often referred to as electrostatic fields, are characteristically different from electric fields created by time-varying magnetic fields. While the former is a conservative field, implying that no net work is done on a test charge if it goes around in a complete loop in the field, the latter is, by definition, not a conservative field; net work is done, and it is proportional to the rate of change of magnetic flux.
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Related Experiment Video

Updated: Jul 24, 2025

Author Spotlight: Controlled Human Exposure Model for Tick Research and Lyme Disease Studies

Author Spotlight: Controlled Human Exposure Model for Tick Research and Lyme Disease Studies

Published on: December 1, 2023

Static electricity passively attracts ticks onto hosts.

Sam J England¹, Katie Lihou², Daniel Robert²

¹School of Biological Sciences, Faculty of Life Sciences, University of Bristol, 24 Tyndall Avenue, BS8 1TQ Bristol, UK; Museum für Naturkunde - Leibniz Institute for Evolution and Biodiversity Science, Invalidenstraße 43, 10115 Berlin, Germany.

Current Biology : CB

|July 1, 2023

Summary

Terrestrial animals

Keywords:

Acari Ixodes ricinus charge ectoparasites electric ecology electric fields electrostatics parasitism polarization triboelectricity

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Saliva, Salivary Gland, and Hemolymph Collection from Ixodes scapularis Ticks

Saliva, Salivary Gland, and Hemolymph Collection from Ixodes scapularis Ticks

Published on: February 21, 2012

Area of Science:

Biophysics
Ecology
Zoology

Background:

Organisms accumulate electrostatic charges, influencing environmental interactions.
The ecological role of natural static electricity in host-parasite dynamics is understudied.
Mammals, birds, and reptiles possess significant electrostatic charges.

Purpose of the Study:

To investigate the role of electrostatic forces in tick-host interactions.
To determine if electrostatic attraction aids ectoparasites in host detection.
To explore the biophysical mechanisms of tick-host engagement.

Main Methods:

Experimental testing of electrostatic attraction on Ixodes ricinus ticks.
Theoretical modeling of electric field interactions.
Analysis of electrostatic force dependence on electric field polarity.

Main Results:

Ixodes ricinus ticks are attracted to hosts via electrostatic forces over air gaps.
This electrostatic attraction mechanism is independent of electric field polarity.
The attraction relies on induced electrical polarization within the tick.

Conclusions:

Electrostatic forces play a significant role in tick-host interactions.
This mechanism enhances ectoparasite host-finding capabilities.
Findings may inform novel strategies for tick-borne disease control.