Physics

Problem

Calculate the magnitude of the electrostatic force between two point charges of

+4\,\mu\text{C}

and

+1\,\mu\text{C}

separated by

20\,\text{cm}

in air. (Use

k = 9\times10^{9}\,\text{N\,m}^2\text{/C}^2

.) a)

0.18\,\text{N}

0.90\,\text{N}

4.5\,\text{N}

0.09\,\text{N}