When a block of mass \( M \) is suspended by a long wire of length \( L \), the length of the wi...

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When a block of mass \( M \) is suspended by a long wire of length \( L \), the length of the wire becomes \( (L+l) \). The elastic potential energy stored in the extended wire is
(a) \( M g L \)
(b) \( \frac{1}{2} M g l \)
(c) \( \frac{1}{2} M g L \)
(d) \( M g l \)
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