A small disc can slide in a circular path on a frictionless incline...

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A small disc can slide in a circular path on a frictionless inclined plane inclined at an angle
\( \mathrm{P} \) of \( 30^{\circ} \) with the help of a thread as shown. Mass

W of the disc is \( \mathrm{m} \) and acceleration due to gravity is g. If the disc is released, when the thread is horizontal, expression for the tension in the thread at the lowest point is
(1) \( \frac{1}{2} \mathrm{mg} \)
(2) \( \frac{3}{2} \mathrm{mg} \)
(3) \( 2 \mathrm{mg} \)
(4) \( 3 \mathrm{mg} \)
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