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A chain of length \( (l0.5 \pi R) \) placed on a smooth spherical
\( \mathrm{P} \) surface of radius \( R \) with one of its ends fixed at the top the sphere. The value of tangential acceleration of each element of
W chain when its upper end is released :
(A) \( \frac{R g}{l}\left(1-\sin \frac{l}{R}\right) \)
(B) \( \frac{R g}{l}\left(1-\cos \frac{l}{R}\right) \)
(C) \( \frac{R g}{l}\left(1-\tan \frac{l}{R}\right) \)
(D) \( \frac{R g}{l}\left(1-\cot \frac{l}{R}\right) \)
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