Two infinite, straight, parallel wires, each carrying current I in the same direction, are coincident with the lines (1, 0, z) and (−1, 0, z). In addition, there is a large external field B₀ = B₀ ẑ. An atom (mass M) whose magnetic dipole moment m₀ is always anti-parallel to the local magnetic field direction can be trapped at the origin. What is the approximate frequency of small oscillations in the vicinity of the origin?