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Electric field

The strength of an electric field E is defined as a vector field that associates to each point in space the force per unit of charge exerted on an infinitesimal positive test charge at rest at that point.

 


Explanation

An electric field surrounds an electric charge, and exerts force on other charges in the field, attracting or repelling them. It is a vector quantity that plays a role in electromagnetic field theory and thus also in the Maxwell equations.

 


Example 1

The Maxwell equation of the electromagnetic field is

where

    ε0 Electric constant
    D Electric displacement field
    P Polarization

 


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