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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 `-4 F`

B

Force of repulsion `4 F`

C

force of attraction `-F//4`

D

Force of repulsion `F//4`.

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