Two point masses and 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 point masses

m_1

and

m_2

attract each other with force

F

when their centres are

r

apart. If

m_1

is doubled while the separation is reduced to

\dfrac{r}{2}

(with

m_2

unchanged), the new gravitational force will be (a)

4F

(b)

8F

(c)

2F

(d)

\dfrac{F}{2}