A) $ mg2R $
B) $ \frac{2}{3}mgR $
C) $ 3mgR $
D) $ \frac{1}{3}mgR $
সঠিক উত্তর: B
বিভব শক্তির পরিবর্তন $ \Delta U=-\frac{GMm}{R+2R}-( -\frac{GMm}{R} ) $
$ =-\frac{GMm}{3R}+\frac{GMm}{R} $ $ =\frac{2GMm}{3R}=\frac{2}{3}mgR $ $ [ \because g=\frac{GM}{R^{2}} ] $
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