In the figure, the minimum value of \( a \) at which the cylinder starts rising up the inclined ...

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In the figure, the minimum value of \( a \) at which the cylinder starts rising up the inclined surface is
(a) \( g \tan \theta \)
(b) \( g \cot \theta \)
(c) \( g \sin \theta \)
(d) \( g \cos \theta \)
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