Two identical solid copper spheres of radius R placed in contact with each other. The gravitational attracton between them is proportional to
(a) R2 (b) R–2
(c) R4 (d) R–4
Answer: c
(18)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)