A force of 100 Newton is applied to an area of 100 micrometre squared determine the pressure exerted on the area in newtons per metre squared

the electric field is a “force field” around a charged object that illustrates the direction the electric force would push an imaginary 

the answer is ampere

the ampere is used to measure electricity. an ampere is a unit of electric current equal. a unit of measure for the flow of current in a circuit. one ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance.

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.