Three long, straight electrical cables, running north and south, are tightly enclosed in an insulating sheath. One of the cables carries a 23.4Acurrent southward; the other two carry currents of 19.5 A and 7.2 Anorthward.
Use Ampere's law to calculate the magnitude of the magnetic field at a distance of 10.0mfrom the cables.
Express your answer to two significant figures and include the appropriate units.