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Two thin long conductors seprated by a distance d carry currents

Two thin long conductors seprated by a distance d carry currents I₁ and I₂ in the same direction. They exert a force F on each other. Now, the current in one of them is increased to two times and its direction is reversed. The distance is also increased to 3d. The new value of force between them is

Options

(a) (-2F)
(b) F/3
(c) (-2F/3)
(d) (-F/3)

Correct Answer:

(-2F/3)

Explanation:

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