What units are used to measure electric field strength?

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In the International System of Units (SI) and the metre-kilogram-second system, electric field strength is measured in newtons per coulomb (N/C), which is equivalent to volts per metre (V/m).123

In the centimetre-gram-second system, the electric field is expressed in units of dynes per electrostatic unit (esu), which is equivalent to statvolts per centimetre.1