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

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(A) According to Newton's law of universal gravitation,the force $F$ between two objects of masses $m_1$ and $m_2$ separated by a distance $r$ is given by $F = G \frac{m_1 m_2}{r^2}$.If the mass of each particle is doubled,the new masses become $m_1' = 2m_1$ and $m_2' = 2m_2$.The new gravitational force $F'$ is given by $F' = G \frac{(2m_1)(2m_2)}{r^2} = 4 	imes (G \frac{m_1 m_2}{r^2}) = 4F$.Therefore,the gravitational force becomes $4$ times the original value.

Two particles are placed at some distance. If the mass of each of the two particles is doubled,keeping the distance between them unchanged,the value of gravitational force between them will be

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