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Q.

A sphere of mass  M and radius  R2 has a concentric cavity of radius  R1 as shown in figure. The force  F exerted by the sphere on a particle of mass  m located at a distance  r from the centre of sphere varies as  0≤r≤∞

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a

b

c

d

answer is B.

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Detailed Solution

Inside the cavity the acceleration due to gravity is zero and outside the shell it varies inversely proportional to  r2 and in the annular region it increase in some non linear manner. Hence option (2) is correct
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