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  2. Coulomb's law - Wikipedia

    en.wikipedia.org/wiki/Coulomb's_law

    If the charges have the same sign, the electrostatic force between them makes them repel; if they have different signs, the force between them makes them attract. Being an inverse-square law , the law is similar to Isaac Newton 's inverse-square law of universal gravitation , but gravitational forces always make things attract, while ...

  3. Electrostatics - Wikipedia

    en.wikipedia.org/wiki/Electrostatics

    The fact that the force (and hence the field) can be calculated by summing over all the contributions due to individual source particles is an example of the superposition principle. The electric field produced by a distribution of charges is given by the volume charge density ρ ( r ) {\displaystyle \rho (\mathbf {r} )} and can be obtained by ...

  4. Non-contact force - Wikipedia

    en.wikipedia.org/wiki/Non-contact_force

    The most familiar non-contact force is gravity, which confers weight. [1] In contrast, a contact force is a force which acts on an object coming physically in contact with it. [1] All four known fundamental interactions are non-contact forces: [2] Gravity, the force of attraction that exists among all bodies that have mass. The force exerted on ...

  5. Static electricity - Wikipedia

    en.wikipedia.org/wiki/Static_electricity

    Electrostatic discharge while fueling with gasoline is a present danger at gas stations. [24] Fires have also been started at airports while refueling aircraft with kerosene. New grounding technologies, the use of conducting materials, and the addition of anti-static additives help to prevent or safely dissipate the buildup of static electricity.

  6. Electric potential energy - Wikipedia

    en.wikipedia.org/wiki/Electric_potential_energy

    When talking about electrostatic potential energy, time-invariant electric fields are always assumed so, in this case, the electric field is conservative and Coulomb's law can be used. Using Coulomb's law, it is known that the electrostatic force F and the electric field E created by a discrete point charge Q are radially directed from Q.

  7. Relativistic electromagnetism - Wikipedia

    en.wikipedia.org/wiki/Relativistic_electromagnetism

    What is charge density in electrostatics becomes proper charge density [5] [6] [7] and generates a magnetic field for a moving observer. A revival of interest in this method for education and training of electrical and electronics engineers broke out in the 1960s after Richard Feynman 's textbook. [ 8 ]

  8. Charles-Augustin de Coulomb - Wikipedia

    en.wikipedia.org/wiki/Charles-Augustin_de_Coulomb

    He is best known as the eponymous discoverer of what is now called Coulomb's law, the description of the electrostatic force of attraction and repulsion. He also did important work on friction , and his work on earth pressure formed the basis for the later development of much of the science of soil mechanics .

  9. Method of image charges - Wikipedia

    en.wikipedia.org/wiki/Method_of_image_charges

    The method of image charges (also known as the method of images and method of mirror charges) is a basic problem-solving tool in electrostatics.The name originates from the replacement of certain elements in the original layout with fictitious charges, which replicates the boundary conditions of the problem (see Dirichlet boundary conditions or Neumann boundary conditions).