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Q.

A hollow sphere of radius R is made of a metal whose specific gravity is  ρ   . The sphere will float in water if the thickness of wall of the sphere is(density of water is 1 gm/cc)

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a

>R3ρ

b

=2R3ρ

c

d

<4R3ρ

answer is C.

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Detailed Solution

4πR2xρ=43πR3ρw   x →the thickness of the wall.xρ=R3    ρw=1x=R3ρ
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