A spring of force constant k is cut into lengths of ratio 1 : 2 : 3 . They are connected in series and the new force constant is k ′ . If now they are connected in parallel and force constant is k ′ ′ , then k ' : k ' ' is

Question

A spring of force constant k is cut into lengths of ratio 1 : 2 : 3 . They are connected in series and the new force constant is k ′ . If now they are connected in parallel and force constant is k ′ ′ , then k ' : k ' ' is, 1 : 6, 1 : 9, 1 : 11, 1 : 14

MARKS App · Accepted Answer

Spring constant ∝ 1 l e n g t h k ∝ 1 l , Spring constant for the length ratios are k 1 = 6 k k 2 = 3 k k 3 = 2 k In series connection of springs, 1 k ′ = 1 6 k + 1 3 k + 1 2 k 1 k ′ = 6 6 k k ′ = k . In parallel connection of springs, k ' ′ = 6 k + 3 k + 2 k k ′ ′ = 11 k k ′ k ′ ′ = 1 11 i.e., k ′ : k ′ ′ = 1 : 11

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