48.  E-field: the electric field or electric intensity E.  That field on a spinning charged mass which produces an electrical force, hence linear motion of the charge.  (In the new theory, the E-field CONSISTS OF the spinning charged mass, moving through a finite change in electrostatic scalar potential, and thus there is a more fundamental generatrix of FORCE.)  Defined as the force per unit charge (i.e., per unit of charged mass).  On a free electron, there may exist two separate E-fields, one in the direction of motion of the electron (normally due to voltage); and one at right angles to the electron's motion, due to the time derivative of the A-field.