Two point charges and separated by experience a force

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

Problem

Two point charges

+6\,\mu\text{C}

and

-3\,\mu\text{C}

separated by

12\,\text{cm}

experience a force

F

. If each charge is tripled while the separation is reduced to

6\,\text{cm}

, the new magnitude of force will be (a)

18F

(b)

36F

(c)

9F

(d)

12F