Answer
The net gravitational force on the particle due to the shells is zero.
Work Step by Step
At a radial distance $c$, the point is inside both of the shells.
Therefore, the net gravitational force on the particle due to the shells is zero.
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 13 - Gravitation - Problems - Page 380: 24c
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