Angular Acceleration of an L-Shaped System

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Two identical uniform rods, each of mass $M$ and length $L$ , are welded together at their ends to form a perpendicular L-shape. A torque $\tau$ is applied at the welded joint, perpendicular to the plane containing the L-shape. What is the angular acceleration $\alpha$ of the system about an axis through the welded joint?

$\frac{\tau}{ML^2}$

$\frac{12\tau}{11ML^2}$

$\frac{12\tau}{ML^2}$

$\frac{3\tau}{2ML^2}$

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