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Q.

A copper sphere attached to the bottom of a vertical spring is oscillating with time period 10 s. If the copper sphere is immersed in a fluid (assume the viscosity of the fluid is negligible) of specific gravity 14 of that of the copper, then time period of the oscillation is

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a

5 s

b

10 s

c

2.5 s

d

20 s

answer is B.

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Detailed Solution

Given, time period, T=2πmk=10 sWhen the spring system is immersed in liquid with specific gravity 14th of the copper, but as the liquid is non-viscous in nature, so the time period would not be changed because there will be no change in m and k.

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