InterviewSolution
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InterviewSolution
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Two concentric shells of masses `M_(1)` and `M_(2)` are having radii `r_(1)` and `r_(2)`. Which of the following is the correct expression for the gravitational field on a mass `m`? A. `F=(G(M_(1)+M_(2)))/(r^(2))`, for `rltr_(1)`B. `F=(G(M_(1)+M_(2)))/((r^(2))`, for `rltr_(2)`C. `F=(GM_(2))/(r^(2))`, for `r_(1)ltrltr_(2)`D. `F=GM_(1)/(r^(2))`, for `r_(1)ltrltr_(2)` |
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Answer» Correct Answer - C Gravitational field inside a shell is zero, but for points outside it, the shell behaves as if whole of its mass is concentrated at its centre. Hence, for a point lying in between the shells there will be a field only due to the inner shell `(=GM_(2)//r^(2))` because the point will be an external point for the inner shell but internal for the outer shell. |
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