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Question

A simple pendulum with a brass bob has a time period T. The bod is now immersed in a non viscous liquid and oscillated. If the density of the liquid is 1/8 that of brass, the time period of the same pendulum will be

A
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B
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C
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D
T
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Solution

The correct option is A
Due to buoyancy, the effective acceleration due to gravity decreases from g to g=gg/8=7g/8.Since T=2πlg.
The new time period will be
T=2πlg=2πl7g/8Thus TT=g7g/8=87T.
Hence the correct choice is (a).

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