an electric field is represented by the force on which particle?\no a neutron\no a dipole\no a negative test…

Brief Explanations:

By convention, an electric field is defined in terms of the force exerted on a positive test - charge. A positive test charge is used because it has a well - defined direction of force in an electric field. Neutrons are neutral and do not experience a force due to an electric field. Dipoles experience a torque in an electric field in addition to a force in non - uniform fields, but the electric field is not defined by the force on a dipole. A negative test charge experiences a force opposite to the direction of the electric field vector.

Answer:

D. a positive test charge