Two thin long parallel wires, separated by a distance $d$ carry a current of $I$ $amp$ in  the same direction. They will
  • Aattract each other with a force of $\mu_0I^2/2 \pi d^2$ per unit length.
  • Brepel each other with a force of $\mu_0I^2/2 \pi d^2$ per unit length.
  • Cattract each other with a force of $\mu_0I^2/2 \pi d$ per unit length.
  • Drepel each other with a force of $\mu_0I^2/2 \pi d$ per unit length.
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