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Q.

Two spheres one of mass M has radius R. Another sphere has mass 4M and radius 2R. The centre to centre distance between them is 12R. Find the distance from the centre of smaller sphere where net gravitational field is zero.

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a

2R

b

3R

c

4R

d

R

answer is D.

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Detailed Solution

Two spheres one of mass M has radius R. Another sphere has mass 4M and radius 2R. The centre to centre distance between them is 12 R. Find the distance from the

GMr2=G(4M)(12R-r)2

Solving this equations, we get r=4R

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