Dipole

Dipole is a term used in physics and chemistry to describe a pair of equal and oppositely charged or magnetized poles separated by a distance. A simple example of a dipole is a pair of electric charges or magnetic poles of equal magnitude but opposite sign, separated by some (usually small) distance.

Physics

In physics, a dipole can refer to various quantities that can be defined as a vector from one pole to the other. For example, the electric dipole moment p points from the negative charge to the positive charge, and has magnitude p = qd, where q is the charge magnitude and d is the separation distance. An electric dipole is effectively a pair of electric charges of equal magnitude but opposite sign, separated by some distance.

Chemistry

In chemistry, a dipole refers to the separation of charges within a molecule between two covalently bonded atoms. Here, the molecular dipole moment may be defined as a measure of the polarity of the molecule. For example, the water molecule (H2O) has a large dipole moment due to the polar covalent bonds between hydrogen and oxygen.

Dipole Antenna

A dipole antenna is a radio antenna that can be made of a simple wire, with a center-fed driven element. It consists of two metal conductors of rod or wire, oriented parallel and collinear with each other (in line with each other), with a small space between them.

See Also

• Electric dipole moment
• Magnetic dipole moment
• Antenna (radio)
• Molecular physics
• Chemical polarity

References

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