Point charges and their movement in 3 space

[Ic3Blu3]

Hey all this question appeared on my last assignment that was due on friday and had me completely stumped for the entire week and well still does, i couldnt even get off the ground (im not very good with these algebra questions) . anyway in the interests to doing my very best on my midterm exam ive come here in search of help.
1. The problem statement, all variables and given/known data

Two equal charges q located at (0,0,0) and (0,b,0) at time zero are moving with speed v in the positive direction (v<<c). Find the ratio of the magnitudes of the magnetic and electrostatic force on each.



any help with this question would be much appreciated a starting point or a walk through of how to obtain the final result because i cant find anything on this in tipler. thankyou

[Ic3Blu3]

i think ive made some progress but i know that the magnitude of the electrostatic force is http://upload.wikimedia.org/math/7/a/8/7a85faff067d0e0bb170bf933919881e.png but how is this equation altered when a velocity is applied to it ?

[denverdoc]

well for the purposes of this question, the velocity since it is the same does not enter the equation you have posted.

Magnetic force completely different. Particles at rest, no magnetic interaction. so can you post an eqn or two that is concerned with magnetic fields, forces.

[srikanth.isro]

When the charges are at rest, the only force between them is the electrostatic force. But when the charges move with a velocity then a magnetic field is produced around them.