Three infinitely long thin wires, each carrying current i, in the same direction, are in the x– y plane of gravity free space. The central wire is along the y–axis while other two are along x = ±d . If the central wire is displaced, along the z–direction, by a small amount, and released, it starts executing simple harmonic motion. If the linear density of wire is λ. The frequency of oscillations will be
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(1) \(\frac{i}{2\pi d}\sqrt{\frac{μ_0}{\pi λ}}\)
(2) \(\frac{i}{d}\sqrt{\frac{μ_0}{\pi λ}}\)
(3) \(\frac{i}{\pi d}\sqrt{\frac{μ_0}{\pi λ}}\)
(4) \(\frac{2i}{\pi d}\sqrt{\frac{μ_0}{\piλ}}\)