Two concentric spherical shells with uniformly distributed masses M₁ = 687 kg and M₂ = 239 kg are situated as shown in the figure. Find the magnitude of the net gravitational force on a particle of mass m = 41 kg, due to the shells, when the particle is located at radial distance (a) a = 36 m, (b) b = 21 m, and (c) c = 3.1 m.
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