Hello,

The electric field is defined mathematically as a vector field that associates to each point in space the (electrostatic or Coulomb) force per unit of charge exerted on an infinitesimal positive test charge at rest at that point. ... Electric fields are created by electric charges, or by time-varying magnetic fields.

the magnitude of the electric field ( E ) produced by a point charge with a charge of magnitude Q, at a point a distance r away from the point charge, is given by the equation E = kQ/r 2 , where k is a constant with a value of 8.99 x 10 9 N m 2 /C