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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

F=0 when 0≤r≤R1because intensity is zero inside the cavity.F increase when R1≤r≤R2F∝1r2 when r>R2
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