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As per your syllabus, total gravitational PE of four equal masses at corners of a square of side l is approximately which?
A−5.41 G m² / l
B−G m² / l
C−4 G m² / l
D−10 G m² / l
Answer & Solution
Correct answer: A. −5.41 G m² / l
syllabus Ex 7.3: 4 pairs at distance l + 2 diagonal pairs at l√2
⇒ U = −2Gm²/l(2 + 1/√2) = −5.41 Gm²/l.
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