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In the given figure, the axial magnetic field at a point \( P \), at a distance \( r \) from the centre \( O \) of a solenoid is (Consider \( m \) as the magnitude of the magnetic moment of the solenoid).
(a) \( B=\frac{2 \mu_{0}}{3 \pi} \frac{2 m}{r^{3}} \)
(b) \( B=\frac{4}{3} \frac{\mu_{0}}{\pi} \frac{2 m}{r^{3}} \)
(c) \( B=\frac{\mu_{0}}{4 \pi} \frac{2 m}{r^{3}} \)
(d) \( B=\frac{\mu_{0}}{2 \pi} \frac{2 m}{r^{3}} \)
\( \mathrm{P} \)
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