9. Two long straight wires are mounted parallel to each other, with one wire directly above the other. Each wire has a weight per unit length of w = 2.0 × 10⁻⁵ N/m. The separation between the wires is d = 0.080 m. The wires carry currents that are equal in magnitude but opposite in direction. Find the current I in each wire. (Given: permeability constant μ₀ = 4π × 10⁻⁷ T·m/A)
(A) 1.8 A
(B) 2.4 A
(C) 2.8 A
(D) 3.2 A
(E) 3.6 A

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