Question

Three spherical shells of masses `M`, `2M` and `3m` have radit `R`, `3R` and `4r` as shows in figure. Find net potential at point `P`, where `CP = 2R`

Answer 1

Correct Answer - A::B::C::D
Pint `p` lies outside the innermost shall. So, in the denominator we will substitude actual distance of `p` from the center or `r = CP = 2R`. ltbr gt This point `p` lies inside the other two shells. So, we substitude their radii, `3r` and `4R` in the denominator.
`:. V_(P) = - (GM)/(2R) - (G(2M))/(3R) - (G(3M))/(4R) = - (23 GM)/(12 R)`