Physics · 2017
JEE Main · 8 April 2017, Shift 1 · Q6
Moment of inertia of an equilateral triangular lamina ABC, about the axis passing through its centre O and perpendicular to its plane is I_o as shown…
Moment of inertia of an equilateral triangular lamina ABC, about the axis passing through its centre O and perpendicular to its plane is $\displaystyle \mathrm{I}_{\mathrm{o}}$ as shown in the figure. A cavity DEF is cut out from the lamina, where D, E, F are the mid points of the sides. Moment of inertia of the remaining part of lamina about the same axis is :
Official answer
(2)
$\displaystyle \frac{15}{16} \mathrm{I}_{\mathrm{o}}$
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JEE Main 2017 Physics question, with the answer from NTA’s final answer key. Where our answers come from.