Two positive point charges of and repel each other with a force of in vacuum

PHYSICS · Subjective · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

Two positive point charges of

+1.5\,\text{nC}

and

+2.5\,\text{nC}

repel each other with a force of

8.0\times10^{-3}\,\text{N}

in vacuum. Determine their separation distance in meters.