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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

A

`-2F`

B

`F/3`

C

`-(2F)/(3)`

D

`-(F)/(3)`

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The correct Answer is:
c
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