Aparticle might be placed
1. inside a uniform spherical shell of mass m, but not at the center
2. inside a uniform spherical shell of mass m, at the center
3. outside a uniform spherical shell of mass m, a distance r from the center
4. outside a uniform solid sphere of mass m, a distance 2r from the center
rank these situations according to the magnitude of the gravitational force on the particle, least to greatest.
a) all tie
b) 1, 2, 3, 4
c) 1 and 2 tie, then 3 and 4 tie
d) 1 and 2 tie, then 3, then 4
e) 1 and 2 tie, then 4, then 3