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A string of electric Christmas lights, unlit, decorating the edge of a roof on a house in Keswick, Ontario, Canada; Christmas 2008. Traditional C6 bulbs were typically 15 volts, and used in series strings of eight bulbs, or multiples of 8.
Christmas lights were too expensive for the average person; as such, electric Christmas lights did not become the majority replacement for candles until 1930. [20] In 1895, US President Grover Cleveland sponsored the first electrically lit Christmas tree in the White House. It featured over a hundred multicolored lights.
A dipole is characterised by its dipole moment, a vector quantity shown in the figure as the blue arrow labeled M. It is the relationship between the electric field and the dipole moment that gives rise to the behaviour of the dielectric. (Note that the dipole moment points in the same direction as the electric field in the figure.
Electric dipole p and its torque τ in a uniform E field. An object with an electric dipole moment p is subject to a torque τ when placed in an external electric field E. The torque tends to align the dipole with the field. A dipole aligned parallel to an electric field has lower potential energy than a dipole making some non-zero angle with it.
The dipole was suspended inside a "squashed-pumpkin"-shaped vacuum chamber, which was about 5.2 meters in diameter and ~3 meters high. [15] At the base of the chamber was a charging coil. This coil is used to charge the dipole, using induction. Next, the dipole is raised into the center of the chamber using a launcher-rather system running ...
In physics, a dipole (from Ancient Greek δίς (dís) 'twice' and πόλος (pólos) 'axis') [1] [2] [3] is an electromagnetic phenomenon which occurs in two ways: An electric dipole deals with the separation of the positive and negative electric charges found in any electromagnetic system. A simple example of this system is a pair of charges ...
When the transition involves more than one charged particle, the transition dipole moment is defined in an analogous way to an electric dipole moment: The sum of the positions, weighted by charge. If the i th particle has charge q i and position operator r i , then the transition dipole moment is: ( t.d.m. a → b ) = ψ b | ( q 1 r 1 + q 2 r 2 ...
An electric dipole transition is the dominant effect of an interaction of an electron in an atom with the electromagnetic field. Following reference, [ 1 ] consider an electron in an atom with quantum Hamiltonian H 0 {\displaystyle H_{0}} , interacting with a plane electromagnetic wave
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