Suppose you want to detemine the electrical field in a certain region of space. You have a small object of known charge and an instrument that is measures the magnitude and direction of the force exerted on the object by the electrical field.
a. The object has a charge of +20.0µC and the instrumental indicates that the electrical force exerted on it is 40.0 µN, due east. What are the magnitude and direction of the electrical field?
b. What are the magnitude and direction of the electrical field if the object has a charge of -10.0 µC and the instrument indicates that the force is 20.0 µN, due West?