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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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