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Question

Two concentric shells of masses M1 and M2 are having radii r1 and r2. Which of the following is the correct expression for the gravitational field on a mass m?
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A
F=G(M1+M2)r2, for r<r1
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B
F=G(M1+M2)r2, for r<r2
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C
F=GM2r2, for r1<r<r2
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D
F=GM1r2, for r1<r<r2
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