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A block of mass \( m \) is placed on a smooth inclined wedge \( A B C \) of inclination \( \theta \) as shown in the figure. The wedge is given an acceleration \( a \) towards the right. The relation between \( a \) and \( \theta \) for the block to remain stationary on the wedge is
(a) \( a=g \cos \theta \)
(b) \( a=\frac{g}{\sin \theta} \)
(c) \( a=\frac{g}{\operatorname{cosec} \theta} \)
(d) \( a=g \tan \theta \)
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