E = kq/r2
V = -∫ E ⋅ ds
W = -Vq
The Attempt at a Solution
a) I just summed up the electric fields: +ek/a2 +ek/a2 -ek/a2 so I get +ek/a2 as a result. Not sure if this is correct since -e has a y component so I was thinking to use sin but not sure which angle to use.
b) i would just plug in the electric field from part a and plug in a as the distance, so V = -Ea
c) W = -Vq, get the potential from b and for q get the sum of charges. Not sure if that's a correct approach.
d) I'm not sure what equation to use for this.