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Question

A simple pendulum with a solid metal bob has time period T. The metal bob is now completely immersed in a liquid of density one-tenth that of the bob. The liquid is non-viscous. Now the period of the same pendulum, remaining all the time immersed in the liquid, will be,

A
T
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B
(910)T
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C
T109
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D
9T10
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Solution

The correct option is C T109
Let us represent the combined gravitational force and buoyant force acting on the mass as mg'

Let, ρs is the density of solid bob and ρl is the density of liquid.

mg=mgρlVg

ρsVsg=ρsVsgρlVsg

g=g(lρlρs)

Here, ρl=ρs10

g=g(1110)=910g
or, gg=910

Now, T=2πlg
T1g

TT=gg

T=T109

Hence, (C) is the correct answer.
Why this question?
If the combined gravitational force and buoyant force acting on the submerged mass is mg' then,
g=g[1ρlρs]
Where ρs is the density of solid bob and ρl is the density of the liquid.

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