Force of attraction between two parallel...

Force of attraction between two parallel current carrying conductors is F newton per metre Currents through each of them are doubled and reversed. New force in `Nm^-1` between these conductions is

A

force of attraction-4F

B

force of repulsion-4F

C

force of attraction-`F/4`

D

force of repulsion -`F/4`

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The correct Answer is:

A

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