Q 3346301273.     A solid sphere of radius r made of a soft material of bulk modulus K is surrounded by a liquid in a cylindrical container. A massless piston of area a floats on the surface of the liquid, covering entire cross section of cylindrical container. When a mass m is placed on the surface of the piston to compress the liquid, the fractional decrement in the radius of the sphere, `((dr)/r)` is

JEE 2018 Mains 8 April
A

`(Ka)/(3mg)`

B

`(mg)/(3Ka)`

C

`(mg)/(Ka)`

D

`(Ka)/(mg)`

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