## Dipole |

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In **dipoles**:

- An
electric dipole is a separation of positive and negative charges. The simplest example of this is a pair ofelectric charges of equal magnitude but opposite sign, separated by some (usually small) distance. A permanent electric dipole is called anelectret . - A
magnetic dipole is a closed circulation ofelectric current . A simple example of this is a single loop of wire with some constant current through it.^{[1]}^{[2]}

Dipoles can be characterized by their dipole moment, a vector quantity. For the simple electric dipole given above, the *converge* to 0 while simultaneously, the charge strength should *diverge* to infinity in such a way that the product remains a positive constant.)

For the current loop, the

In addition to current loops, the ^{[3]} It is also possible that the electron has an *electric* dipole moment although it has not yet been observed (see

A permanent magnet, such as a bar magnet, owes its magnetism to the intrinsic magnetic dipole moment of the electron. The two ends of a bar magnet are referred to as poles (not to be confused with *south* pole (south-seeking pole) of its dipole moment and vice versa.

The only known mechanisms for the creation of magnetic dipoles are by current loops or quantum-mechanical

The term comes from the *dis*), "twice"^{[4]} and πόλος (*polos*), "axis".^{[5]}^{[6]}

- classification
- molecular dipoles
- quantum mechanical dipole operator
- atomic dipoles
- field of a static magnetic dipole
- field from an electric dipole
- torque on a dipole
- dipole radiation
- see also
- notes
- references
- external links

A *physical dipole* consists of two equal and opposite point charges: in the literal sense, two poles. Its field at large distances (i.e., distances large in comparison to the separation of the poles) depends almost entirely on the dipole moment as defined above. A *point (electric) dipole* is the limit obtained by letting the separation tend to 0 while keeping the dipole moment fixed. The field of a point dipole has a particularly simple form, and the order-1 term in the

Although there are no known *point dipole* has a magnetic field of exactly the same form as the electric field of an electric point dipole. A very small current-carrying loop is approximately a magnetic point dipole; the magnetic dipole moment of such a loop is the product of the current flowing in the loop and the (vector) area of the loop.

Any configuration of charges or currents has a 'dipole moment', which describes the dipole whose field is the best approximation, at large distances, to that of the given configuration. This is simply one term in the multipole expansion when the total charge ("monopole moment") is 0—as it *always* is for the magnetic case, since there are no magnetic monopoles. The dipole term is the dominant one at large distances: Its field falls off in proportion to 1/*r*^{3}, as compared to 1/*r*^{4} for the next (*r* for higher terms, or 1/*r*^{2} for the monopole term.

Other Languages

العربية: ثنائي قطب

беларуская: Электрычны дыполь

беларуская (тарашкевіца): Электрычны дыполь

български: Дипол

català: Dipol

čeština: Elektrický dipól

dansk: Dipol

Deutsch: Dipol

eesti: Dipool

español: Dipolo eléctrico

Esperanto: Dupoluso

فارسی: دوقطبی الکتریکی

français: Dipôle électrique

Gaeilge: Déphol

հայերեն: Դիպոլ

हिन्दी: द्विध्रुव

hrvatski: Dipol

italiano: Dipolo elettrico

עברית: דיפול

ქართული: დიპოლი

қазақша: Диполь

मराठी: चुंबकी ध्रुव

Nederlands: Dipool

日本語: 双極子

norsk: Dipol

norsk nynorsk: Dipol

Piemontèis: Dipòlo elétrich

polski: Dipol

português: Dipolo

română: Dipol

русский: Диполь (электродинамика)

Scots: Dipole

Simple English: Dipole

slovenčina: Elektrický dipól

slovenščina: Električni dipol

српски / srpski: Дипол

srpskohrvatski / српскохрватски: Dipolni moment

suomi: Sähködipoli

svenska: Elektrisk dipol

தமிழ்: இருமுனையி

Türkçe: Dipol

українська: Диполь

中文: 偶極子