Two point charges and are fixed apart in air

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

Problem

Two point charges

+6\,\mu\text{C}

and

+24\,\mu\text{C}

are fixed

30\,\text{cm}

apart in air. Find the position(s) along the straight line joining the charges where a

+1\,\mu\text{C}

test charge would experience zero net electrostatic force. Give your answer as the distance from the

+6\,\mu\text{C}

charge.