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The axial field \( \left(B_{A}\right) \) of a bar magnet for \( rl \) is
(a) \( -\frac{\mu_{0}}{4 \pi} \frac{2 m}{r^{3}} \)
(b) \( \frac{\mu_{0}}{4 \pi} \frac{2 m}{r^{3}} \)
(c) \( \frac{\mu_{0}}{4 \pi} \frac{2 m}{l^{3}} \)
(d) \( -\frac{\mu_{0}}{4 \pi} \cdot \frac{2 m}{l^{3}} \)
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