APFIVE Gravitational Force Inside a Spherical Shell
A particle of mass m is inside a uniform spherical shell of mass M and inner radius R₁ and outer radius R₂. The particle is at distance r from the center, where R₁ < r < R₂. The gravitational force on the particle is proportional to:
A
M/r²
B
Mr/R₂³
C
The mass enclosed between radii R₁ and r
D
(M/R₂³)(r - R₁³/r²)
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