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A uniform ring of mass \(M\) and radius \(R\) has a particle of mass \(m\) placed at its centre, as shown in the figure. The gravitational force exerted by the particle (mass : \(m\)) on the ring (mass : \(M\)) is:
           
1. proportional to \(\dfrac{Mm}{R^2}\) 2. proportional to \(\dfrac{Mm}{R^3}\)
3. proportional to \(\dfrac{Mm}{R}\) 4. zero
Subtopic:  Gravitational Field |
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