A circular coil has moment of inertia \( 0.8 \mathrm{~kg} \mathrm{~m}^{2} \) around any diameter...

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A circular coil has moment of inertia \( 0.8 \mathrm{~kg} \mathrm{~m}^{2} \) around any diameter and is carrying current to produce a magnetic moment of \( 20 \mathrm{Am}^{2} \). The coil is kept initially in a vertical position and it can rotate freely around a horizontal diameter. When a uniform magnetic field of \( 4 \mathrm{~T} \) is applied along the vertical, it starts rotating, around its horizontal diameter. The angular speed the coil acquires after rotating by \( 60^{\circ} \) will be
(1) math xmlns=http://www.w3.org/1998/Math/MathMLmn10/mnmo×/momsupmn3/mnmrowmn1/mnmo//momn4/mn/mrow/msup/math math xmlns=http://www.w3.org/1998/Math/MathMLmir/mimia/mimid/mimsupmis/mimrowmo-/momn1/mn/mrow/msup/math
(2) \( 10 \pi \mathrm{rad} \mathrm{s}^{-1} \)
(3) \( 20 \mathrm{rad} \mathrm{s}^{-1} \)
(4) \( 20 \pi \mathrm{rad} \mathrm{s}^{-1} \)
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