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(D) According to Newton's law of universal gravitation,the force of attraction $F$ between two masses $m_1$ and $m_2$ separated by a distance $r$ is g

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Is reduced to a quarter

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(D) According to Newton's law of universal gravitation,the force of attraction $F$ between two masses $m_1$ and $m_2$ separated by a distance $r$ is given by $F = G \frac{m_1 m_2}{r^2}$.From this formula,we can see that $F \propto \frac{1}{r^2}$.If the distance $r$ is doubled,the new distance becomes $r' = 2r$.The new gravitational force $F'$ will be $F' = G \frac{m_1 m_2}{(2r)^2} = G \frac{m_1 m_2}{4r^2} = \frac{1}{4} F$.Therefore,the gravitational attraction is reduced to a quarter of its original value.

If the distance between two masses is doubled,the gravitational attraction between them

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