Q.

Two concentric shells of masses M1 and M2, are . having radii r1, andr2. Which of the following is correct expression for the gravitational field on a mass m?

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a

F=GM1+M2r2,  for r

b

F=GM1+M2r2,  for r

c

F=GM2r2,  for r1

d

F=G2r2,  for r1

answer is D.

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Detailed Solution

We know that the gravitational field in aside a shell is zero but for points outside it, the shell behaves as if whole of its mass is concentrated at its centre. When a point lies in between the shells r1
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Two concentric shells of masses M1 and M2, are . having radii r1, andr2. Which of the following is correct expression for the gravitational field on a mass m?