1. For an electron: a)Calculate the change in electric potential energy when the magnitude of the electric field is 250 N/C, the starting position is 2.4 m from the origin, and the final position is 3.9m from the origin. b)Determine the initial speed of the electron assuming its speed has decreased to half of its initial speed after the same displacement.

2. Fields are used to describe how electric, magnetic and gravitational forces can act without touching. These three forces have similarities and differences. Which two forces are the most similar to each other? Support your answer with words, diagrams, equations and demonstrations that you could do.