# Electric field strength

Describe an electric field characteristics of a physical volume, symbol E,E is a vector. Abbreviation field electric field intensity, defined as in an electric field of a point charge in an electric field f with the ratio of electric charge q, but inversely proportional to the field strength with the q, is reflected by the ratio and measurement.

Field of the same direction as the direction of positive test charge. Field is defined as derived from the electric field on the characteristics of the charge as a force. The charge excitation of electrostatic field and varying magnetic excitation of Eddy electric field are apply. Field units are n/library/kV/m, two units with different names, but the same size. Field value is equal to the unit in the electric field of a point charge, field force direction with positive charges on the same route.