Two very long,straight,parallel conductors $A$ and $B$ carry currents of $5\,A$ and $10\,A$ respectively and are at a distance of $10\,cm$ from each other. The direction of current in the two conductors is the same. The force acting per unit length between the two conductors is: $(\mu_0 = 4\pi \times 10^{-7} \text{ SI unit})$

• A
  $2 \times 10^{-4} \text{ N/m}$ and is attractive
• B
  $2 \times 10^{-4} \text{ N/m}$ and is repulsive
• C
  $1 \times 10^{-4} \text{ N/m}$ and is attractive
• D
  $1 \times 10^{-4} \text{ N/m}$ and is repulsive