Physics

Problem

Two positive point charges

+4\,\mu\text{C}

and

+9\,\mu\text{C}

are fixed

30\,\text{cm}

apart in vacuum. At what distance from the

+4\,\mu\text{C}

charge, measured along the line joining the charges, is the electric field zero? a)

18\,\text{cm}

24\,\text{cm}

12\,\text{cm}

9\,\text{cm}