(To be precise: for the definition of the dipole moment, one should always consider the "dipole limit", where, for example, the distance of the generating charges should converge to 0 while simultaneously, the charge strength should diverge to infinity in such a way that the product remains a positive constant.)įor the magnetic (dipole) current loop, the magnetic dipole moment points through the loop (according to the right hand grip rule), with a magnitude equal to the current in the loop times the area of the loop. For the simple electric dipole, the electric dipole moment points from the negative charge towards the positive charge, and has a magnitude equal to the strength of each charge times the separation between the charges. ĭipoles, whether electric or magnetic, can be characterized by their dipole moment, a vector quantity. A bar magnet is an example of a magnet with a permanent magnetic dipole moment. A simple example is a single loop of wire with constant current through it. A magnetic dipole is the closed circulation of an electric current system.(A permanent electric dipole is called an electret.) A simple example of this system is a pair of charges of equal magnitude but opposite sign separated by some typically small distance.
An electric dipole deals with the separation of the positive and negative electric charges found in any electromagnetic system.In physics, a dipole (from Greek δίς (dis) 'twice', and πόλος (polos) 'axis' ) is an electromagnetic phenomenon which occurs in two ways: By comparison, Earth has a south magnetic pole near its north geographic pole and a north magnetic pole near its south pole. The magnetic field of a sphere with a north magnetic pole at the top and a south magnetic pole at the bottom.
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