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If a bob of mass 'm' is attached as shown in figure. When displaced , the pendulum will undero S.H.M. with a period T is equal to

A

`2pi sqrt((L)/(g))`

B

`2pi sqrt((m)/(k))`

C

`2pi (1)/(sqrt((g)/(L) + (k)/(m)))`

D

`2pi sqrt((L)/(g) + (2pi)/(m))`

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