dipole
noun [ C ] uk/ˈdaɪ.pəʊl/ us/ˈdaɪ.poʊl/
(IN SCIENCE)
physics specialized偶极子
two poles that have opposite and equal electrical charge or magnetic force, with a space between them
Geomagnetic South Pole represents the axis of the Earth's magnetic dipole. 地磁南极代表地球磁偶极子的轴。
chemistry specialized偶极子
a molecule with an area of negative charge and an area of positive charge that are separated
Many molecules (such as those of water) are electric dipoles, meaning that they have a partial positive charge at one end and a partial negative charge at the other. 许多分子（例如水分子）都是电偶极子，也就是说分子的一端含部分正电荷，另一端含部分负电荷。
- More examples
- By Maxwell's time, it was clear that the electromagnetic field was the means by which electrical charges and magnetic dipoles act on each other at a distance.
- If the dipolarity of the generator in the power system is lost, mechanical energy has to be fed into the shaft of the generators to restore the dipole.
- The centre of positive charge does not coincide with the centre of negative charge; we say that the bond is polar or that it has a dipole.
- The bent molecule H2O has a dipole, but the linear CO2 (O=C=O) does not.
(FOR RADIO)
(also dipole antenna)偶极子天线
a simple type of radio aerial (= a structure that receives or sends out radio signals) that is shaped like the letter T
With most FM radio stations today, a vertical dipole gives as much signal as a horizontal one. 对如今大多数的调频广播电台来说，垂直偶极子天线和水平偶极子天线发出的信号的强度是一样的。
- More examples
- The world's first radio astronomer, he presided over a field of dipoles (antennas) 3,500 feet in diameter while continuing his private research.
- I use a 440mHz transmitter radio with a 6.5" horizontal dipole antenna.