Q1: In the diagram above there are three locations denoted by the letters A, B, and C. Draw separate force diagrams for our particle when placed at each location. Show the net force acting on the particle.  If the net force equals zero, state this as your answer. Explain your answer.

Vector A points down, Vector B points up, Vector C points down. Forces will never equal zero.

Q2: Suppose our particle is moved from point D to point E, with constant velocity like a bead on a frictionless wire.  Explain what work must be done by (or removed from) our system.  Explain your answer.

 

Zero work will be done. No movement by the Coulomb force (F) or by the electrical field (E).

Q3: Suppose our particle is moved from point F to point G.  How much work must be done by (or removed from) our system.  Explain your answer.

_ = qDv = qEDs for work done on system. Energy is stored as potential. Any path can be taken because Ds will be the same.