A planet in some galaxy has four identical moons revolving around it. three of the moons have the same orbit of radius R while one of them has 2R orbital radius. If the mass of each of the moon is m and that of the planet is M, then what will be the net gravitational force acting on the planet by the moons? Take $G M m / R^{2} = F$ .

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5F/4

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3F/2

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3F/4

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Solution

The correct option is D 3F/4
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