In physics, an electric field or E-field is an effect produced by an electric charge (or a time-varying magnetic field) that exerts a force on charged objects in the field.

## Explained

The SI units of the electric field are newtons per coulomb or volts per meter (both are equivalent).

Electric fields contain electrical energy with energy density proportional to the square of the field intensity. Electric fields exist around all charges; the direction of field lines at a point is defined by the direction of the electric force exerted on a positive test charge placed at that point. The strength of the field is defined by the ratio of the electric force on a charge at a point to the magnitude of the charge placed at that point. In the dynamic case the electric field is accompanied by a magnetic field, by a flow of energy, and by real photons.

The concept of electric field was introduced by Michael Faraday .

The electric field or electric field intensity is a vector quantity, and the electric field strength is the magnitude of this vector.

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