$A$ short bar magnet has a length $2l$ and a magnetic moment $10 \text{ Am}^2$. Find the magnetic field at a distance of $z = 0.1 \text{ m}$ from its centre on the axial line. Here,$l$ is negligible as compared to $z$.
- A$1 \times 10^{-3} \text{ T}$
- B$4 \times 10^{-3} \text{ T}$
- C$2 \times 10^{-3} \text{ T}$
- D$3 \times 10^{-3} \text{ T}$
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