Two point masses \( m_{1} \) and \( m_{2} \) are separated by a distance \( r \). The gravitatio...

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Two point masses \( m_{1} \) and \( m_{2} \) are separated by a distance \( r \). The gravitational potential energy of the system is \( G_{1} \). When the separation between the particles is doubled, the gravitational potential energy is \( G_{2} \). Then, the ratio of \( \frac{G_{1}}{G_{2}} \) is
(a) 1
(b) 2
(c) 3
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