Four pairs of small spheres are listed below with their centre-to-centre separations

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

Four pairs of small spheres are listed below with their centre-to-centre separations. Neglect all forces except mutual gravitation. Which pair will experience the greatest gravitational attraction? (a)

6\,\text{kg}

and

7\,\text{kg}

separated by

3\,\text{cm}

(b)

8\,\text{kg}

and

9\,\text{kg}

separated by

5\,\text{cm}

(c)

3\,\text{kg}

and

3\,\text{kg}

separated by

1\,\text{cm}

(d)

4\,\text{kg}

and

5\,\text{kg}

separated by

2\,\text{cm}

Related theory

Universal Law of Gravitation
Gravitation

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