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  2. Perfect conductor - Wikipedia

    en.wikipedia.org/wiki/Perfect_conductor

    Since energy is not being lost to heat, the current will not dissipate; it will flow indefinitely within the perfect conductor until there exists no potential difference. require a constant magnetic flux – the magnetic flux within the perfect conductor must be constant with time. Any external field applied to a perfect conductor will have no ...

  3. Electrical conductor - Wikipedia

    en.wikipedia.org/wiki/Electrical_conductor

    The ampacity of a conductor, that is, the amount of current it can carry, is related to its electrical resistance: a lower-resistance conductor can carry a larger value of current. The resistance, in turn, is determined by the material the conductor is made from (as described above) and the conductor's size.

  4. Valence and conduction bands - Wikipedia

    en.wikipedia.org/wiki/Valence_and_conduction_bands

    In solid-state physics, the valence band and conduction band are the bands closest to the Fermi level, and thus determine the electrical conductivity of the solid. In nonmetals, the valence band is the highest range of electron energies in which electrons are normally present at absolute zero temperature, while the conduction band is the lowest range of vacant electronic states.

  5. Dielectric - Wikipedia

    en.wikipedia.org/wiki/Dielectric

    A perfect dielectric is a material with zero electrical conductivity (cf. perfect conductor infinite electrical conductivity), [9] thus exhibiting only a displacement current; therefore it stores and returns electrical energy as if it were an ideal capacitor.

  6. Eddy current - Wikipedia

    en.wikipedia.org/wiki/Eddy_current

    In a perfect conductor with no resistance, surface eddy currents exactly cancel the field inside the conductor, so no magnetic field penetrates the conductor. Since no energy is lost in resistance, eddy currents created when a magnet is brought near the conductor persist even after the magnet is stationary, and can exactly balance the force of ...

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  8. Permittivity - Wikipedia

    en.wikipedia.org/wiki/Permittivity

    A perfect conductor has infinite conductivity, σ = ∞, while a perfect dielectric is a material that has no conductivity at all, σ = 0; this latter case, of real-valued permittivity (or complex-valued permittivity with zero imaginary component) is also associated with the name lossless media. [18]

  9. Kate Middleton's Emotional Return to Royal Walkabouts ... - AOL

    www.aol.com/kate-middletons-emotional-return...

    Kate Middleton’s return to greeting the public on Christmas Day was a poignant moment, not just for her, but for the many who had been eagerly awaiting her comeback after a difficult year. For ...