Electric field of dielectric cylinder with given surface charge density immersed in electrolite

The article discloses the importance of demonstration tasks in physics teaching in sec-ondary schools. The place of the demonstration tasks and the possibilities of applying them during physics teaching are analyzed. Four demonstration tasks of electrostatics phenomena in the secondary school are presented and analyzed. They are: Two types of electrical charge; Distribution of surface-charge density; Electric field of electrified sphere; Electric field of two electrically charged plates. Logical reasoning schemes to these physics demo tasks are developed. The proposed reasoning schemes designed to improve students' thinking, explaining the observed demonstrations of physical phenomena which help students to: un-derstand the essence of the demo task, determine cause - effect relationships and dependen-cies, compare the conditions and findings, summarize the results and do conclusions. Such using of demonstration tasks is useful to both of teacher and pupil: teacher manages the con-tent of teaching and a learning of pupils, pupils - are focused to self-activities, encouraged to think, analyze, summarize and do conclusions. Key words: demonstration task, electrostatics phenomena, logical reasoning schemes, phys-ics teaching,

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Improved algorithm of surface charge density distribution and electric field distribution on insulating materials

2017 1st International Conference on Electrical Materials and Power Equipment (ICEMPE) ◽

10.1109/icempe.2017.7982142 ◽

2017 ◽

Cited By ~ 1

Author(s):

Han Wang ◽

Jian-Yi Xue ◽

Yi-Bo Wang ◽

Guo-Qiang Su ◽

Jun-Bo Deng ◽

...

Keyword(s):

Electric Field ◽

Density Distribution ◽

Charge Density ◽

Surface Charge ◽

Field Distribution ◽

Surface Charge Density ◽

Electric Field Distribution ◽

Charge Density Distribution ◽

Insulating Materials ◽

Improved Algorithm

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Comparison of Surface Electrochemical Properties between Purple Rocks and their Derived Soils as Related to Pedogenesis

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.476-478.958 ◽

2012 ◽

Vol 476-478 ◽

pp. 958-964

Author(s):

Fei Nan Hu ◽

Chao Fu Wei ◽

Jing Du

Keyword(s):

Field Strength ◽

Electric Field ◽

Charge Density ◽

Electrochemical Properties ◽

Surface Charge ◽

Surface Potential ◽

Surface Charge Density ◽

Soil Surface ◽

Specific Area ◽

Parent Rocks

Soil surface electrochemical properties may have an important effect on soil fertility and genesis. Few researches are available on the changes of surface electrochemical properties of purple soils during the pedogenesis. In present work, four purple rocks and their derived soils under arable, orchard, forest and grass were collected to determine surface electrochemical properties including surface specific area, surface charge quantity, surface charge density, electric field strength, and surface potential using the kinetic method. The results indicated that soil surface specific area and surface charge quantity of soils were both significantly higher than their parent rocks. There were similar trends in surface potential, surface charge density and electric field strength of soils and parent rocks, soils derived from Shaximiao Formation (J2s) and Suining Formation (J3s) were higher than those of parent rocks, whereas the reverse trends existed in Feixianguan Formation (T1f) and Penglaizhen Formation (J3p). At the same time, surface potential of soil samples collected from four sites with different land utilization, i.e., Arable, Orchard, Forest and Grass, were determined to illustrate the various trends of soil electrochemical properties change. Under different land use patterns, the descending orders of soil surface potential in Shaximiao Formation (J2s) and Suining Formation (J3s) were both as follows: orchard > forest > arable > grass; the order in Feixianguan Formation (T1f) and Penglaizhen Formation (J3p) were as: orchard > forest > grass > arable. On the other hand, the value of soil surface charge quantity was increased with clay content and soil acidity because of the intensive physical weathering and slight chemical weathering. Therefore, the surface electrochemical properties may have some agreements with the weathering extent of the purple soils. Soil surface potential, surface charge quantity, surface charge density, electric field strength, and surface specific area could be employed as reference criteria for pedogenesis of purple soils.

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Analytical Solution for the Electric Field Response Generated by a Nonconducting Ellipsoid (Prolate Spheroid) in a Conducting Fluid Subject to an External Electric Field

Brain and Human Body Modeling 2020 ◽

10.1007/978-3-030-45623-8_22 ◽

2020 ◽

pp. 383-389

Author(s):

Andrey B. Yakovlev ◽

Valeriya S. Federyaeva

Keyword(s):

Analytical Solution ◽

Electric Field ◽

Charge Density ◽

Surface Charge ◽

Surface Charge Density ◽

Prolate Spheroid ◽

Conducting Fluid ◽

Cell Modeling ◽

Surface Charge Distribution ◽

Field Response

AbstractAn analytical solution is presented for the electric field response generated by a nonconducting ellipsoid (prolate spheroid) in a homogeneous conducting fluid subject to an external primary electric field, including surface charge distribution. Such a solution might be useful for different purposes, including cell modeling subject to an external quasistatic electromagnetic stimulus. The solution utilizes the well-known analogy between the electrostatics of dielectrics and DC conduction. The solution obtained includes an expression for the volumetric fields and an expression for the induced surface charge density at the membrane.

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