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A spherical hollow is made in a lead sphere of radius  such that its surface touches the outside surface of the lead sphere and passes through the centre. The mass of the lead sphere before hollowing was . The force of attraction that this sphere would exert on a particle of mass  which lies at a distance  from the centre of the lead sphere on the straight line joining the centres of the sphere and the hollow is

a)

b)

c)

d)



Question ID - 55039 | SaraNextGen Top Answer

A spherical hollow is made in a lead sphere of radius  such that its surface touches the outside surface of the lead sphere and passes through the centre. The mass of the lead sphere before hollowing was . The force of attraction that this sphere would exert on a particle of mass  which lies at a distance  from the centre of the lead sphere on the straight line joining the centres of the sphere and the hollow is

a)

b)

c)

d)

1 Answer
127 votes
Answer Key / Explanation : (d) -

(d)

Gravitational force between sphere of mass  and the particle of mass  at  is

If  is the mass of the removed part of sphere, then

Gravitational force between the removed part and the particle of mass  at B is

  Required force,

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