Two very long straight parallel conductors of negligible cross-section carrying equal electric current of $1 \text{ mA}$ are placed one metre apart in a vacuum. The force produced per metre length is $\qquad \text{ N}$. (Given: $\mu_0 = 4\pi \times 10^{-7} \text{ T m A}^{-1}$)
- A$2 \times 10^{-7}$
- B$2 \times 10^{-13}$
- C$2 \times 10^{-10}$
- D$2 \times 10^{-4}$
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