What will be the force constant of the spring system shown in fig. (7)
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a
k12+k2
b
12k1+1k2−1
c
12k1+1k2
d
2k1+1k2−1
answer is B.
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Detailed Solution
Two spritrgs of force constants k1 and k2 are in parallel. Hence k′=k1+k1=2k1 The third spring is il series with spring of force constant k ∴ 1k=12k1+1k2 or k=12k1+1k2−1