Physics - Rotation Question with Solution | TestHub

A thin massless rod of length $2\ell$ has equal point masses m attached at its ends (see figure). The rod is rotating about an axis passing through its centre and making angle $\theta$ with it. The magnitude of the rate of change of its angular momentum $\left|\frac{\mathrm{d}\overrightarrow{\mathrm{L}}}{\mathrm{dt}}\right|$ about centre of rod is :