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13.Oscillations
easy
The effective spring constant of two spring system as shown in figure will be

A
$K_1 + K_2$
B
$K_1K_2/(K_1 + K_2)$
C
$K_1 -K_2$
D
$K_1K_2/(K_1 -K_2)$
Solution
When external force is applied, one spring gets extended and another gets contracted by the same distance, hence force due to two springs act in same direction.
$\text { i.e., } F=F_1+F_2 $
$-k x=-k_1 x-k_2 x $
$k=k_1+k_2 .$
Standard 11
Physics
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