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**Don't know where to begin....mag field question**

1. Homework Statement

http://s685.photobucket.com/albums/vv212/dewdr0p714/?action=view¤t=physicsexam2q2.jpg

Each support string connects to a corner of the rectangular ceiling. The current carrying wires are .5m apart. The current carrying wires have a mass per unit length of .150 kg/m. The currents are identical and in opposite directions.

Point A is 1m away from the wire on the right

Point B is exactly between the 2 wires

Point C is 1.5 m away from the wire on the left

(all the points are in the same plane as the 2 wires)

b) Determine the magnetic field B at Point A, Point B, and Point C

2. Homework Equations

i think this formula is supposed to be used but I'm not sure...B = F / |q0|(vsinθ)

3. The Attempt at a Solution

I just dont know where to begin with this problem...can anyone give me any pointers?