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A bar magnet when placed at an angle of \( 30^{\circ} \) to the
\( \mathrm{P} \) direction of magnetic field induction of \( 5 \times 10^{-2} \mathrm{~T} \), experiences a moment of couple
W \( 25 \times 10^{-6} \mathrm{~N}-\mathrm{m} \). If the length of the magnet is \( 5 \mathrm{~cm} \) its pole strength is
(1) \( 2 \times 10^{-2} \mathrm{~A}-\mathrm{m} \)
(2) \( 5 \times 10^{-2} \mathrm{~A}-\mathrm{m} \)
(3) \( 2 \mathrm{~A}-\mathrm{m} \)
(4) \( 5 \mathrm{~A}-\mathrm{m} \)
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