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Two concentric spherical shells have mas...

Two concentric spherical shells have masses `M_1,M_2` and radii `R_1,R_2(R_1ltR_2)`. What is the force exerted by this system on a particle of mass `m` if it is placed at a distance `(R_1+R_2)/2` from the center?

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The correct Answer is:
A, B, D
The gravitatioN/Al force on m due to the shell of `M_2 is 0`.
m is a distance `(R_1+R_2)/2`
then gravitatioN/Al force due ot M is given by
=(GM_1m)/(((R_1+R_2)/2)^2)=(4GM_1m)/((R_1+R_2)^2)`
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