Four potential of magnetic dipole at rest

[Feynmanfan]

I have some trouble with this electromagnetism problem: I need to transform the four-potential of a magnetic dipole at rest, in order to obtain it's value in a reference frame (I understand it's the Lab frame) where we see the dipole moving at v.

I know what the magnetic vector potential is : A and the scalar potential is zero but how do I make this transform?

Thanks for your help

 

[Meir Achuz]

phi transforms like t, and A_x transforms like x in the Lorentz transform equations.