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The equatorial field \( \left(B_{E}\right) \) of a bar magnet at a distance \( r \), for \( r \gg l \), where \( l \) is the size of the magnet is that
(a) \( \frac{\mu_{0} m}{4 \pi r^{3}} \)
(b) \( -\frac{\mu_{0} m}{4 \pi r^{3}} \)
(c) \( \frac{\mu_{0} m}{4 \pi l^{3}} \)
(d) \( -\frac{\mu_{0} m}{4 \pi l^{3}} \)
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