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Question

A metallic sphere weighing 2.1 kg in the air is held by a string so as to be completely immersed in a liquid of relative density 0.8. The relative density of metallic is 10.5. The tension in the string in Kg-wt is

A
1.6
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B
1.94
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C
3.1
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D
5.25
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Solution

The correct option is B 1.94
Density of metal =10.5gcc
mass of solid =2.1kg=2100gm
Volume of solid =210010.5=200cc
Buoyant force =0.8×200×9=160g×103N=1.6N
So, Tension =2.1g0.16g=1.94g=1.94kgwt


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