1) A combination of two electrically or magnetically charged
particles of opposite signs, which are separated by a very small
nâhamsângardi-ye dipol, ~ diqotbé
Fr.: anisotropie dipolaire
A form of anistropy in the temperature of the → cosmic microwave background radiation, appearing as one hot pole and one cold pole, caused by our motion with respect to the cosmic background radiation. The temperature variations, amounting to 1 part in 1000, yield a velocity of about 600 km/sec for our Galaxy with respect to the background. → cosmic microwave background anisotropy.
→ dipole; → anisotropy.
ânten-e dipol, ~ diqotbé
Fr.: antenne dipôle
One of the simplest kinds of antenna which is connected at the center to a radio-frequency feed line for transmitting or receiving radio frequency energy. It differs from the dish antenna in that it consists of many separate antennas that collect energy by feeding all their weak individual signals into one common receiving set.
gaštâvar-e doqotbé (#)
Fr.: moment dipolaire
1) The product of the strength of either of the charges in an
→ electric dipole and the distance separating the two charges.
It is expressed in → coulomb meters. Dipole moment is a
→ vector quantity.
Its direction is defined as toward the positive charge. In chemistry dipole moment is
a quantitative measure of polarity in a molecule;
the unit is the → debye.
Fr.: rayonnement dipolaire
The electromagnetic radiation produced by an oscillating → electric dipole or → magnetic dipole.
dipol-e barqi, diqotbe-ye ~
Fr.: dipôle électrique
1) A type of → charge distribution
consisting of two charges, a
positive and a negative charge of the same magnitude separated by a
distance s, which is small compared to the distance r to
the point P at which the → electric potential
is V and the → electric field
intensity is E.The potential falls as the
square of the distance (1/r2) and the electric
field intensity decreases as
the cube of the distance (1/r3).
Fr.: dipole magnétique
A system that generates a → magnetic field in which the field is considered to result from two opposite poles, as in the north and south poles of a magnet, much as an → electric field originates from a positive and a negative charge in an → electric dipole. A loop carrying an electric current also acts as a magnetic dipole. Magnetic dipoles experience a torque in the presence of magnetic fields. → dipole moment; → magnetic moment.
magnetic dipole moment
gaštâvar-e doqotbe-ye meqnâtisi
Fr.: moment dipolaire magnétique
Same as → magnetic moment.
tâbeš-e doqotbe-ye meqnâtisi (#)
Fr.: rayonnement du dipôle magnétique
Radiation emitted by a rotating magnet.