The force between two unit pole strengths placed at a distance of $1 \, m$ is:

  • A
    $1 \, N$
  • B
    $\frac{10^{-7}}{4\pi} \, N$
  • C
    $10^{-7} \, N$
  • D
    $4\pi \times 10^{-7} \, N$

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