A system consists of a uniform electric field of 42.6 N/C, directed in the positive x direction, together with a particle having a positive charge of 7.87x10-6 C. The particle is moved from the location x = 1.50 m to the location x = 3.50 m in the field, and it is stationary before and after it is moved.
(a) What is the work done on the system by the external force?
(b) What is the work done by the field on the particle?
(c) What is the change in the potential energy of the system?