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The gravitational force between two arbitrary finite rigid bodies is:
ANot always along the line of centres
BZero once the bodies touch
CAlways along the line of centres
DAlways perpendicular to that line
Answer & Solution
Correct answer: A. Not always along the line of centres
Only point masses and spherically symmetric bodies give a strictly central force; for irregular rigid bodies the net force need not pass along the line joining their centres of mass.
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