When two infinitely long parallel wires separated by a distance of 1 m, each carry a current of 3 A, the force in $N/m$ length experienced by each will be given $\mu_0 = 4 \pi \times 10^{-7}$ SI units :

Question

( A ) $18 \times 10^{-7}$
( B ) $6 \times 10^{-7}$
( C ) $2 \times 10^{-7}$
( D ) $3 \times 10^{-7}$