A long spring when stretched by \( x \mathrm{~cm} \), has a potential energy \( U \). On increas...
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0A long spring when stretched by \( x \mathrm{~cm} \), has a potential energy \( U \). On increasing the stretching to \( n x \mathrm{~cm} \), the potential energy stored in spring will be
(A) \( U / n \)
(B) \( n U \)
(C) \( n^{2} U \)
(D) \( U / n^{2} \)
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