Two long parallel wires are at a distanc...

Two long parallel wires are at a distance of 1 m. Both of them carry 1A of current. The force of attraction per unit length between the two wires is

`2xx10^-7 N m^-1`

`2xx10^-8 N m^-1`

`5xx10^-8 N m^-1`

`5xx10^-7 N m^-1`

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