![]() More or fewer lines may be drawn depending on the precision to which it is desired to represent the field. ![]() ![]() : 479 The field lines are a representative concept the field actually permeates all the intervening space between the lines. Field lines due to stationary charges have several important properties, including always originating from positive charges and terminating at negative charges, they enter all good conductors at right angles, and they never cross or close in on themselves. This illustration has the useful property that the field's strength is proportional to the density of the lines. The electric field can be visualized with a set of lines whose direction at each point is the same as the field's, a concept introduced by Michael Faraday, whose term ' lines of force' is still sometimes used. This means that if the source charge were doubled, the electric field would double, and if you move twice as far away from the source, the field at that point would be only one-quarter its original strength. This is the basis for Coulomb's law, which states that, for stationary charges, the electric field varies with the source charge and varies inversely with the square of the distance from the source. ![]() The electric field acts between two charges similarly to the way the gravitational field acts between two masses, as they both obey an inverse-square law with distance. : 469–70 Fields that may be defined in this manner are sometimes referred to as force fields. having both magnitude and direction), it follows that an electric field is a vector field. : 469–70 As the electric field is defined in terms of force, and force is a vector (i.e. The electric field is defined at each point in space as the force per unit charge that would be experienced by a vanishingly small positive test charge if held stationary at that point. The field is depicted by electric field lines, lines which follow the direction of the electric field in space. Description Įlectric field of a positive point electric charge suspended over an infinite sheet of conducting material. The derived SI unit for the electric field is the volt per meter (V/m), which is equal to the newton per coulomb (N/C). The electric field is defined as a vector field that associates to each point in space the electrostatic ( Coulomb) force per unit of charge exerted on an infinitesimal positive test charge at rest at that point. It is also the force responsible for chemical bonding between atoms that result in molecules. In atomic physics and chemistry, for instance, the electric field is the attractive force holding the atomic nucleus and electrons together in atoms. Electric fields and magnetic fields are both manifestations of the electromagnetic field, one of the four fundamental interactions (also called forces) of nature.Įlectric fields are important in many areas of physics, and are exploited in electrical technology. Electric fields originate from electric charges and time-varying electric currents. It also refers to the physical field for a system of charged particles. An electric field (sometimes E-field ) is the physical field that surrounds electrically charged particles and exerts force on all other charged particles in the field, either attracting or repelling them.
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