Two long conductors, separated by a dist...

Two long conductors, separated by a distance `d` carry current `I_(1) and I_(2)` 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 the force between them is

`-(F)/(3)`

`(F)/(3)`

`(2F)/(3)`

`(-2F)/(3)`

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