A small bar magnet placed with is axis at \( 30^{\circ} \) with an external field of \( 0.06 \ma....

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A small bar magnet placed with is axis at \( 30^{\circ} \) with an external field of \( 0.06 \mathrm{~T} \) experiences a torque of \( 0.018 \mathrm{Nm} \). The minimum work required to rotate it from its stable to unstable equilibrium position is
(1) \( 7.2 \times 10^{-2} \mathrm{~J} \)
(2) \( 6.4 \times 10^{-2} J \)
(3) \( 9.2 \times 10^{-3} \mathrm{~J} \)
(4) \( 11.7 \times 10^{-3} \mathrm{~J} \)


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