A circular disc is to be made by using iron a | vedclass

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(B) The moment of inertia $I$ of a body about an axis is given by $I = \sum m_i r_i^2$,where $m_i$ is the mass at a distance $r_i$ from the axis.To ma

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aluminium at the interior and iron surrounding it

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(B) The moment of inertia $I$ of a body about an axis is given by $I = \sum m_i r_i^2$,where $m_i$ is the mass at a distance $r_i$ from the axis.To maximize the moment of inertia for a given mass,the mass should be distributed as far as possible from the axis of rotation.Since iron is denser than aluminium,placing the denser material (iron) at the periphery (surrounding the interior) increases the moment of inertia significantly compared to placing it at the center.Therefore,placing aluminium at the interior and iron at the surrounding (periphery) is the most effective way to achieve a large moment of inertia.

$A$ circular disc is to be made by using iron and aluminium,so that it acquires a large moment of inertia about its geometrical axis. This is possible with:

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