Two parallel wires in free space are $10 \,cm$ apart and each carries a current of $10 \,A$ in the same direction. The force exerted by one wire on the other [per unit length] is
- A$2 \times 10^{-4} \,N/m$ [attractive]
- B$2 \times 10^{-7} \,N/m$ [attractive]
- C$2 \times 10^{-4} \,N/m$ [repulsive]
- D$2 \times 10^{-7} \,N/m$ [repulsive]
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