Two thin long parallel wires,separated by a distance $d$,carry a current of $I$ $A$ 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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