Question

The effective spring constant of two spring system as shown in figure will be
A. `k_(1)-k_(2)`
B. `k_(1)+k_(2)`
C. `k_(1)k_(2)//k_(1)-k_(2)`
D. `k_(1)k_(2)//k_(1)+k_(2)`

Answer 1

Correct Answer - B
(b) When external force is applied, one spring gets edtedded and another gets contracted by the same distance, hence force due to two springs act in same direction.
i.e., `F=F_(1)+F_(2)`
`-kx=-k_(1)x-k_(2)x`