## Magnetic Dipole

A **magnetic dipole** is the limit of either a closed loop of electric current or a pair of poles as the dimensions of the source are reduced to zero while keeping the magnetic moment constant. It is a magnetic analogue of the electric dipole, but the analogy is not complete. In particular, a magnetic monopole, the magnetic analogue of an electric charge, has never been observed. Moreover, one form of magnetic dipole moment is associated with a fundamental quantum property, the spin of elementary particles.

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### Some articles on magnetic dipole:

Relaxation (NMR) - Microscopic Mechanisms

... mechanism for a nucleus to change orientation with respect to the applied

... mechanism for a nucleus to change orientation with respect to the applied

**magnetic**field and/or interchange energy with the surroundings (called the lattice) ... The most common mechanism is the**magnetic dipole**-dipole interaction between the**magnetic**moment of a nucleus and the**magnetic**moment of another nucleus or other entity (electro ... This interaction depends on the distance between the pair of**dipoles**(spins) but also on their orientation relative to the external**magnetic**field ...**Magnetic Dipole**- Dipolar Fields From Finite Sources

... See also Near and far field The

**magnetic**scalar potential ψ produced by a finite source, but external to it, can be represented by a multipole expansion ... Monopole moments have a 1/r rate of decrease,

**dipole**moments have a 1/r2 rate, quadrupole moments have a 1/r3 rate, and so on ... Since the lowest-order term observed in

**magnetic**sources is the dipolar term, it dominates at large distances ...

**Magnetic Dipole**–dipole Interaction

...

**Magnetic dipole**–

**dipole**interaction, also called dipolar coupling, refers to the direct interaction between two

**magnetic dipoles**... is a unit vector parallel to the line joining the centers of the two

**dipoles**... rjk is the distance between two

**dipoles**, mk and mj ...

Magnetic Monopole - Poles and Magnetism in Ordinary Matter

... table and every particle in the standard model—has no

... table and every particle in the standard model—has no

**magnetic**monopole charge ... Therefore, the ordinary phenomena of magnetism and magnets have nothing to do with**magnetic**monopoles ... First, electric currents create**magnetic**fields according to Ampère's law ...Theory - Atomic Hyperfine Structure -

... term in the hyperfine Hamiltonian is typically the

**Magnetic Dipole**... term in the hyperfine Hamiltonian is typically the

**magnetic dipole**term ... There is an energy associated with a**magnetic dipole**moment in the presence of a**magnetic**field ... For a nuclear**magnetic dipole**moment, μI, placed in a**magnetic**field, B, the relevant term in the Hamiltonian is given by ...### Famous quotes containing the word magnetic:

“We are in great haste to construct a *magnetic* telegraph from Maine to Texas; but Maine and Texas, it may be, have nothing important to communicate.”

—Henry David Thoreau (1817–1862)

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