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Historical Figures and Their Contributions

The first edition of this book was previously published by Pearson Education, Inc. It was The second edition, version 10 is copyright ©2020 by Howard DeVoe. This work is licensed under a Creative Commons Attribution 40 International License: https://creativecommons org/licenses/by/4 0/ The book was typeset using the LATEX typesetting system and the memoir class. Most of the figures were produced with PSTricks, a related software program. The fonts are Adobe Times, MathTime, and Computer Modern Typewriter. A Solutions Manual is available at the Web site linked below. I thank the Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland for hosting the Web site for this book:

Figures (9)

The magnetic field (marked B, indicated by red field lines) around wire carrying an electric current (marked I)
Using the right hand rule to find the direction of the magnetic field
The current entering any junction is equal to the current leaving that junction. i2 + i3 = i1 + i4
The sum of all the voltages around a loop is equal to zero. v1 + v2 + v3 + v4 = 0
The magnitude of the electrostatic force F between two point charges q1 and q2 is directly proportional to the product of the magnitudes of charges and inversely proportional to the square of the distance between them. Like charges repel each other, and unlike charges attract each other.
The most basic Feynman diagram for QED interaction between two fermions
Charles-Augustin de Coulomb
Coulomb's torsion balance
If two charges have the same sign, the electrostatic force between them is repulsive; if they have different sign, the force between them is attractive.

Key Points

  • Coulomb's inverse-square law, or simply Coulomb's law, is a scientific law of physics that describes the amount of force between two electrically charged particles at rest.
  • Kirchhoff's circuit laws are two equalities that deal with the current and potential difference (commonly known as voltage) in the lumped element model of electrical circuits.
  • The current law is applicable to any lumped network irrespective of the nature of the network; whether unilateral or bilateral, active or passive.
  • A resistance thermometer is included in a circuit that measures the thermometer's electric resistance.
  • The time-dependent generalization of Coulomb's law is given by Jefimenko's equations, which describe the electric field and magnetic fields generated by time-dependent distributions of electric charge and current.
  • A matrix version of Kirchhoff's current law is the basis of most circuit simulation software, such as SPICE.

Terms

Tap a term for a plain-language explanation.

Sources & licensing(4)