Two identical spheres attract each other with force when their centres are apart

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

Problem

Two identical spheres attract each other with force

F

when their centres are

d

apart. If the separation is increased to

3d

, the new force between them is (a)

\dfrac{F}{3}

(b)

\dfrac{F}{9}

(c)

\dfrac{F}{6}

(d)

\dfrac{F}{27}