An element $dl = dx \hat{i}$ (where,$dx = 1 \, cm$) is placed at the origin and carries a large current $i = 10 \, A$. What is the magnetic field on the $Y$-axis at a distance of $0.5 \, m$?

  • A
    $2 \times 10^{-8} \hat{k} \, T$
  • B
    $4 \times 10^{-8} \hat{k} \, T$
  • C
    $-2 \times 10^{-8} \hat{k} \, T$
  • D
    $-4 \times 10^{-8} \hat{k} \, T$

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