The cross-section through three long wires of equal linear mass density is illustrated in the figure. The top two wires are attached and fixed to the ceiling and all wires carry the same current. The current is such that the lower wire hangs at equilibrium forming an equilateral triangle with the top two wins. The equilibrium condition of the lower wire is ... O Vertically stable: horizontally unstable O Vertical ly and horizontally stable 2 Vertically and horizontaliv unstable O Indifferent or neutral in all directions O Horizontally stabie; vertically unstable