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If applied torque on a system is zero, i.e., $\tau=0$, then for that system
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The correct answer is:
$\alpha=0$
$\begin{aligned} \tau= & l \alpha \\ & I=\text { moment of inertia } \\ & \alpha=\text { angular acceleration }\end{aligned}$
$\begin{array}{ll}\text { If } & \tau=0 \Rightarrow l \alpha=0 \\ \text { But } & I \neq 0\end{array}$
$\therefore \quad \alpha=0$
$\begin{array}{ll}\text { If } & \tau=0 \Rightarrow l \alpha=0 \\ \text { But } & I \neq 0\end{array}$
$\therefore \quad \alpha=0$
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