Physics

Problem

Two point charges

+4\,\mu\text{C}

and

+1\,\mu\text{C}

are placed

60\ \text{cm}

apart on a straight line. How far from the

+1\,\mu\text{C}

charge, measured along the line joining them, should a third small positive charge be placed so that it experiences zero net electrostatic force? a)

12\ \text{cm}

40\ \text{cm}

20\ \text{cm}

30\ \text{cm}