Cambridge Encyclopedia » Cambridge Encyclopedia Vol. 23

electric field - Coulomb's law, Energy in the electric field, Parallels between electrostatics and gravity

charge force direction positive

The region of electric influence surrounding positive or negative electric charges; symbol E, units V/m (volts per metre); a vector quantity, with field direction specified as the direction of motion of a positive charge placed in the field. For a force F on a test charge of q coulombs, the field is given as E = F/q, ie the electric field is the electric force per unit charge. It may be represented using field lines.

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