### electric field

**(E)**
(electric force as distributed over a space)

An **electric field** (conventionally termed **E** in equations)
is a physical field that at any point, applies some force to
any electrically-charged object located that point in a particular
direction, per Coulomb's law.
Mathematically, it is a gradient, a function on the three
dimensions of space yielding a vector in a direction along the
line of the force (which pushes objects of the two polarities
in opposite directions along the line) with
a magnitude consisting of the amount of force applied to
an object at that point per unit mass and unit electric
charge of the object.
The field that it is the gradient of is termed the
field of **electric potential**.

Two possible mathematical fields describe such a physical field,
so by convention, the field is such that the vectors point in the
direction that a positively-charged object is pushed. (The other
possibility would have all the vectors in exactly the opposite
direction, showing the direction that a negatively-charged object
would be pushed.)

An *electric field* is analogous to a gravitational field,
both following inverse square laws, but incorporates
the concept of electric charge with a polarity (positive and negative)
and that each polarity attracts the other polarity but repels objects
with the same polarity.

(*electromagnetism,electricity,physics*)
**Further reading:**

http://en.wikipedia.org/wiki/Electric_field

**Referenced by pages:**

black hole shadow

CMB polarization

dielectric

dipole

electron screening

electron volt (eV)

Fermi sea

field lines

Gamow peak

ion engine

Lorentz force

magnetic dipole radiation

magnetic flux density (B)

mathematical field

Maxwell's equations

particle spectrometer

physical field

Poisson's equation

polarization modes

Poynting vector (S)

Pioneer Venus Orbiter (PVO)

quantum field theory (QFT)

quantum mechanics (QM)

spinning dust emission

Stark effect

suprathermal

Vlasov-Poisson equation

Index