Two spring of spring constants 
and 
are joined in series. The effective spring constant of the combination is given by:
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
Let us consider two springs of spring constants k 1 and k 2 joined in series as shown in figure.
Under a force F, they will stretch by y 1 and y 2
So y = y 1 + y 2
or 
but as springs are massless, so force on them must be same i.e., F 1 = F 2 = F.
So 
or k = 
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