Chapter 22
Electric Charges and Fields
![Electric Charges](https://jovecdn2.ccindex.cn/files/media/science-education/science-education-thumbs/13700.jpg)
From lightning during thunderstorms to electronic devices, the phenomenon of electromagnetism is all around us. The electromagnetic force is one of…
![Sources and Properties of Electric Charge](https://jovecdn2.ccindex.cn/files/media/science-education/science-education-thumbs/13701.jpg)
All objects we see around us consist of atoms, which combine to form molecules. The lightest element in the universe is hydrogen, and a hydrogen atom…
![Charging Conductors By Induction](https://jovecdn2.ccindex.cn/files/media/science-education/science-education-thumbs/13703.jpg)
The Earth is a good conductor of electricity, and it is so big that it can be considered an infinite source or sink of charges. It can easily…
![Coulomb's Law](https://jovecdn2.ccindex.cn/files/media/science-education/science-education-thumbs/13704.jpg)
Experiments with electric charges have shown that if two objects each have an electric charge, they exert an electric force on each other. The…
![Comparison Between Electrical And Gravitational Forces](https://jovecdn2.ccindex.cn/files/media/science-education/science-education-thumbs/13844.jpg)
There are four fundamental forces in nature: the gravitational force, the electromagnetic force, the strong nuclear force, and the weak nuclear…
![Electric Field](https://jovecdn2.ccindex.cn/files/media/science-education/science-education-thumbs/13706.jpg)
Consider two point charges, each exerting Coulomb force on the other. It is possible to describe the Coulomb interaction via an intermediate step by…
![Continuous Charge Distributions](https://jovecdn2.ccindex.cn/files/media/science-education/science-education-thumbs/13708.jpg)
Imagine a bucket of water. It contains many molecules, of the order of 1026 molecules. Thus, although it contains discrete elements (molecules) at…
![Electric Field of a Continuous Line Charge](https://jovecdn2.ccindex.cn/files/media/science-education/science-education-thumbs/13709.jpg)
In physics, symmetry in a system means that something in the considered system remains unchanged due to a specific operation to which it is…
![Electric Field Lines](https://jovecdn2.ccindex.cn/files/media/science-education/science-education-thumbs/13710.jpg)
The three-dimensional representation of the electric field of a positive point charge requires tracing the electric field vectors, whose lengths…
![Properties of Electric Field Lines](https://jovecdn2.ccindex.cn/files/media/science-education/science-education-thumbs/13711.jpg)
The definition of electric field lines greatly eases the visualization of electric fields, a vector field, especially in the presence of many…
![Electric-field Control of Electronic States in WS<sub>2</sub> Nanodevices by Electrolyte Gating](https://jovecdn2.ccindex.cn/files/thumbs/56862_t.png)
A method of carrier number control by electrolyte gating is demonstrated. We have obtained WS2 thin flakes with atomically flat surface via scotch…
![Finite Element Modelling of a Cellular Electric Microenvironment](https://jovecdn2.ccindex.cn/files/thumbs/61928_t.png)
Finite Element Modelling of a Cellular Electric Microenvironment
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Clinical studies show electrical stimulation (ES) to be a potential therapy for the healing and regeneration of various tissues. Understanding the…
![Fabrication of a Dipole-assisted Solid Phase Extraction Microchip for Trace Metal Analysis in Water Samples](https://jovecdn2.ccindex.cn/files/thumbs/53500_t.png)
Fabrication of a Dipole-assisted Solid Phase Extraction Microchip for Trace Metal Analysis in Water Samples
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This paper describes a fabrication protocol for a dipole-assisted solid phase extraction (SPE) microchip available for trace metal analysis in water…