Physics · 2019
JEE Main · 11 January 2019, Shift 2 · Q7
A circular disc D_1 of mass M and radius R has two identical discs D_2 and D_3 of the same mass M and radius Rattached rigidly at its opposite ends…
A circular disc $\displaystyle D_1$ of mass $\displaystyle M$ and radius $\displaystyle R$ has two identical discs $\displaystyle \mathrm{D}_2$ and $\displaystyle \mathrm{D}_3$ of the same mass M and radius Rattached rigidly at its opposite ends (see figure). The moment of inertia of the system about the axis OO', passing through the centre of $\displaystyle \mathrm{D}_1$, as shown in the figure, will be :
Official answer
(3)
$\displaystyle 3 \mathrm{MR}^2$
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JEE Main 2019 Physics question, with the answer from NTA’s final answer key. Where our answers come from.