Since the magnetic force on a moving charged particle is qv X B, the work done by a static magnetic field is always zero. But consider two parallel currents, both going from left to right. The second current will experience a magnetic force of attraction towards the first current. Therefore, it will move towards the first wire and work will be done on it by the magnetic field. But didn't we just say that it's impossible for a magnetic field to do work? Any help would be greatly appreciated. Thank You in Advance.