A thin horizontal circular disc is rotating a | vedclass

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(B) The system consists of the disc and the insect. Since there is no external torque acting on the system, the angular momentum $L = I\omega$ remains

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first increases and then decreases

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(B) The system consists of the disc and the insect. Since there is no external torque acting on the system, the angular momentum $L = I\omega$ remains constant.As the insect moves from the rim towards the center, the distance of the insect from the axis of rotation decreases, which causes the moment of inertia $I$ of the system to decrease.Since $L = I\omega$ is constant, as $I$ decreases, the angular speed $\omega$ increases.When the insect moves from the center towards the other end of the diameter, the distance from the axis increases, causing the moment of inertia $I$ to increase.Consequently, as $I$ increases, the angular speed $\omega$ decreases.Therefore, the angular speed of the disc first increases and then decreases.

$A$ thin horizontal circular disc is rotating about a vertical axis passing through its centre. An insect is at rest at a point near the rim of the disc. The insect now moves along a diameter of the disc to reach its other end. During the journey of the insect, the angular speed of the disc:

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