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Magnetics question

2020 · 4 Sep · Shift 2 · Q59
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Magnetics question

2020 · 4 Sep · Shift 2 · Q59

JEE MainPhysicsMagneticsMCQ+4 / −1
A circular coil has moment of inertia 0.8 kg m2 around any diameter and is carrying current to produce a magnetic moment of 20 Am2 . 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 T is applied along the vertical,it starts rotating around its horizontal diameter. The angular speed the coil acquires after rotating by 60o will be:
  1. A
    10 π\piπ rad s–1
  2. B
    20 π\piπ rad s–1
  3. C
    10(3)1/410{\left( 3 \right)^{1/4}}10(3)1/4 rad s–1
  4. D
    20 rad s–1
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