Physics

Problem

Two point charges

+4\,\mu\text{C}

and

-2\,\mu\text{C}

are placed

20\,\text{cm}

apart in air. Calculate the magnitude of the force between them. a)

1.8\,\text{N}

0.36\,\text{N}

7.2\,\text{N}

0.18\,\text{N}