Please answer these questions detailed but briefly:) 1. how can you determine if something is conservative or nonconservative?2. Could anyone clarify why the potential energy charge would still be zero at any point? I'm just confused because I thought that potential energy depended on the distance and if it is like that then why is the point charge defined as zero3. What would insulating surfaces be considered as?4. the work done here is positive, so would potential energy decrease? ( see picture)

SOLVE The force and displace- ment are parallel; the work W done by the electric-field force during a displacement of magnitude d is W = Fed cos o with o = 0, so W = Fed = eEd = (1.60 x 10-19 C) (2.80 x 103 N/C) = 2.85 x 10-18 J. REFLECT The amount of work done is proportional to the electric- field magnitude E and to the dis- placement magnitude d of the elec- tron. The electric field does positive work on the electron. If there are no other forces, the electron's ki- netic energy increases by the same amount as the work done on the electron by the electric field