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The closed-coiled helical springs are made from the same small diameter wire, one wound on 2.5 cm diameter core and the other on 1.25 cm diameter core. If each spring has n coils, the ratio of their spring constants would be

[A].	1	[B].	1?2
[C].	1?4	[D].	1?8
[E].	1?16

Answer: Option D

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