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A simple pendulum of length l has a bras...

A simple pendulum of length l has a brass bob attached at its lower end. Its period is T . If a steel bob of same size, having density x times that of brass, replaces the brass bob and its length is changed so that period becomes 2 T, then new length is

A

2l

B

4l

C

4l x

D

`(4l)/x`

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The correct Answer is:
B
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