Force on a Magnet - Current Carrying Wire

[teme92]

Homework Statement

A bar magnet, with pole strength 0.1 Wb and magnetic length (i.e. distance between the poles) of 5 cm, is placed so that one pole is 2 cm and the other 6 cm from a long, straight wire carrying a current of 6 Amps. The magnet lies in a plane perpendicular to the wire. Find the force on each pole of the magnet (indicating its direction on a diagram). What is the torque on the magnet about the axis of the wire

Homework Equations

F=qvB
F=BIl
B=\mu₀I/2\piR
\phi=BA

The Attempt at a Solution

So I said:

F=BIl and B=\mu₀I/2\piR, therefore:

F=\mu₀I²l/2\piR

In this formula is l the distance between the poles and R the distance the pole is from the wire? Any help would be much appreciated.

 

[Simon Bridge]

Neither - afaict it's the wrong equation for the problem.
How do you determine the force on a magnetic pole due to a magnetic field?