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(D) According to the shell theorem,the gravitational field inside a spherical shell is zero.For a point at a distance $r$ such that $r_1 < r < r_2$,th

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$I = \frac{GM_1}{r^2}$ for $r_1 < r < r_2$

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(D) According to the shell theorem,the gravitational field inside a spherical shell is zero.For a point at a distance $r$ such that $r_1 The gravitational intensity due to the inner shell at distance $r$ is $I_1 = \frac{GM_1}{r^2}$.The gravitational intensity due to the outer shell at distance $r$ is $I_2 = 0$ (since it is inside the shell).Therefore,the total gravitational intensity is $I = I_1 + I_2 = \frac{GM_1}{r^2} + 0 = \frac{GM_1}{r^2}$.

Two concentric spherical shells have masses $M_1$ and $M_2$ and radii $r_1$ and $r_2$ $(r_1 < r_2)$. What is the gravitational intensity at a distance $r$ from the center where $r_1 < r < r_2$?

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