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  2. Jefimenko's equations - Wikipedia

    en.wikipedia.org/wiki/Jefimenko's_equations

    e. In electromagnetism, Jefimenko's equations (named after Oleg D. Jefimenko) give the electric field and magnetic field due to a distribution of electric charges and electric current in space, that takes into account the propagation delay ( retarded time) of the fields due to the finite speed of light and relativistic effects.

  3. RC time constant - Wikipedia

    en.wikipedia.org/wiki/RC_time_constant

    RC time constant. The RC time constant, denoted τ (lowercase tau ), the time constant (in seconds) of a resistor–capacitor circuit (RC circuit), is equal to the product of the circuit resistance (in ohms) and the circuit capacitance (in farads ): It is the time required to charge the capacitor, through the resistor, from an initial charge ...

  4. Madelung constant - Wikipedia

    en.wikipedia.org/wiki/Madelung_constant

    The Madelung constant allows for the calculation of the electric potential Vi of the ion at position ri due to all other ions of the lattice. where is the distance between the i th and the j th ion. In addition, 4πε0 = 1.112 × 10−10 C2/ (J⋅m); ε0 is the permittivity of free space.

  5. Slater's rules - Wikipedia

    en.wikipedia.org/wiki/Slater's_rules

    In quantum chemistry, Slater's rules provide numerical values for the effective nuclear charge in a many-electron atom. Each electron is said to experience less than the actual nuclear charge, because of shielding or screening by the other electrons. For each electron in an atom, Slater's rules provide a value for the screening constant ...

  6. Relativistic wave equations - Wikipedia

    en.wikipedia.org/wiki/Relativistic_wave_equations

    e. In physics, specifically relativistic quantum mechanics (RQM) and its applications to particle physics, relativistic wave equations predict the behavior of particles at high energies and velocities comparable to the speed of light. In the context of quantum field theory (QFT), the equations determine the dynamics of quantum fields .

  7. Elementary charge - Wikipedia

    en.wikipedia.org/wiki/Elementary_charge

    Charge quantization is the principle that the charge of any object is an integer multiple of the elementary charge. Thus, an object's charge can be exactly 0 e, or exactly 1 e, −1 e, 2 e, etc., but not ⁠ 1 / 2 ⁠ e, or −3.8 e, etc. (There may be exceptions to this statement, depending on how "object" is defined; see below.)

  8. Time constant - Wikipedia

    en.wikipedia.org/wiki/Time_constant

    Time constant. In physics and engineering, the time constant, usually denoted by the Greek letter τ (tau), is the parameter characterizing the response to a step input of a first-order, linear time-invariant (LTI) system. [1] [note 1] The time constant is the main characteristic unit of a first-order LTI system. It gives speed of the response.

  9. Coupling constant - Wikipedia

    en.wikipedia.org/wiki/Coupling_constant

    In physics, a coupling constant or gauge coupling parameter (or, more simply, a coupling ), is a number that determines the strength of the force exerted in an interaction. Originally, the coupling constant related the force acting between two static bodies to the "charges" of the bodies (i.e. the electric charge for electrostatic and the mass ...

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