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Q.

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 

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a

2 l 

b

4 l

c

4 l x

d

4lx

answer is B.

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Detailed Solution

T∝l Time period depends only on effective length. Density has no effect on time period. If length made 4 times then time period becomes 2 times.

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