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  2. Body capacitance - Wikipedia

    en.wikipedia.org/wiki/Body_capacitance

    Body capacitance was a significant nuisance when tuning the earliest radios; touching the tuning knob controlling the tuner's variable capacitor would couple the body capacitance into the tuning circuit, slightly changing its resonant frequency. Design of such circuits intended to be adjusted by a user must prevent interaction of the user's ...

  3. Electrostatic induction - Wikipedia

    en.wikipedia.org/wiki/Electrostatic_induction

    This charge neutralizes the charge in the gold leaves, so the leaves come together again. The electroscope now contains a net charge opposite in polarity to that of the charged object. When the electrical contact to earth is broken, e.g. by lifting the finger, the extra charge that has just flowed into the electroscope cannot escape, and the ...

  4. Electrostatics - Wikipedia

    en.wikipedia.org/wiki/Electrostatics

    where = is the distance of each charge from the test charge, which situated at the point , and () is the electric potential that would be at if the test charge were not present. If only two charges are present, the potential energy is Q 1 Q 2 / ( 4 π ε 0 r ) {\displaystyle Q_{1}Q_{2}/(4\pi \varepsilon _{0}r)} .

  5. Capacitance - Wikipedia

    en.wikipedia.org/wiki/Capacitance

    Conduction current is related to moving charge carriers (electrons, holes, ions, etc.), while displacement current is caused by a time-varying electric field. Carrier transport is affected by electric fields and by a number of physical phenomena - such as carrier drift and diffusion, trapping, injection, contact-related effects, impact ...

  6. Surface charge - Wikipedia

    en.wikipedia.org/wiki/Surface_charge

    According to Gauss’s law, a conductor at equilibrium carrying an applied current has no charge on its interior.Instead, the entirety of the charge of the conductor resides on the surface, and can be expressed by the equation: = where E is the electric field caused by the charge on the conductor and is the permittivity of the free space.

  7. Cable theory - Wikipedia

    en.wikipedia.org/wiki/Cable_theory

    The models resembled the partial differential equations used by Fourier to describe heat conduction in a wire. The 1870s saw the first attempts by Hermann to model neuronal electrotonic potentials also by focusing on analogies with heat conduction. However, it was Hoorweg who first discovered the analogies with Kelvin's undersea cables in 1898 ...

  8. Heat equation - Wikipedia

    en.wikipedia.org/wiki/Heat_equation

    Suppose that a body obeys the heat equation ... to model heat conduction in a rod. The equation is ... a volume of free space that does not contain a charge.

  9. Electric charge - Wikipedia

    en.wikipedia.org/wiki/Electric_charge

    The total electric charge of an isolated system remains constant regardless of changes within the system itself. This law is inherent to all processes known to physics and can be derived in a local form from gauge invariance of the wave function. The conservation of charge results in the charge-current continuity equation.