Two infinitely long parallel conducting wires A and B carry currents I and 2I , respectively, in the same direction. The wire A has uniform mass per unit length and lies on an insulated floor. The wire B is kept fixed at a height h above the floor. The minimum magnitude of h so that the wire A does not rise from the floor is: [ g is the acceleration due to gravity and 0 is the permeability of free space.]

1. A. 0 I 2 2 g
2. B. 0 I 2 g
3. C. 2 0 I 2 g
4. D. 4 0 I 2 g

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