Physics · 2020
JEE Main · 4 September 2020, Shift 2 · Q13
A circular coil has moment of inertia 0.8 kg m^2 around any diameter and is carrying current to produce a magnetic moment of 20 Am^2. The coil is…
A circular coil has moment of inertia $\displaystyle 0.8 \mathrm{~kg} \mathrm{~m}^2$ around any diameter and is carrying current to produce a magnetic moment of $\displaystyle 20 \mathrm{Am}^2$. The coil is kept initially in a vertical position and it can rotate freely around a horizontal diameter. When a uniform magnetic field of $\displaystyle 4$ T is applied along the vertical, it starts rotating around its horizontal diameter. The angular speed the coil acquires after rotating by $\displaystyle 60$° will be :
Official answer
(2)
$\displaystyle 10 \mathrm{rad} \mathrm{~s}^{-1}$
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JEE Main 2020 Physics question, with the answer from NTA’s final answer key. Where our answers come from.