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 2T, then new length is
A
2 l
B
4 l
C
4 l x
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Time period of simple pendulum
Time period does not depend on density of bob.
Hence, 
Hence, new length is 
.
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