Force on a Negative Charge Q1 in the Presence of a Long Rod

[jaded18]

Consider a very, very long rod (length L) with total negative charge Q0,
uniformly spread out. The rod is located in the plane of the page, is parallel to the top of the
page, and moves right‐ward with a speed v. There is a negative charge Q1 located a small
distance D away from the rod. Neglect gravity.

a) What is the total force (magnitude and direction) acting on the charge Q1 if it is NOT
moving?
b) What is the total force (magnitude and direction) acting on the charge Q1 if it is moving
with out of the page at speed v1?
c) What is the total force (magnitude and direction) acting on the charge Q1 if it is moving
left‐ward at speed v1?

attempt at ANS:
a) coulomb's law = F = k(QQ)/(r^2) = k(Q_e)^2/(D^2)
b) 0 because angle=90?
c) ...

I need help.

 

[Hootenanny]

Are you sure that the only force in play here is the electrostatic force?