Question

Can you please help me I don’t understand the weird u in the problem

Answer 1

In order to calculate the force between the charges, we can use the formula below:

`F=(KQq)/(d^2)`

Where K is the electrostatic constant (K = 9 * 10^9), Q and q are the charges and d is the distance between them (in meters).

So we have:

`\begin{gathered} F=(9\cdot10^9\cdot500\cdot10^(-6)\cdot100\cdot10^(-6))/(0.5^2)\\ \\ F=(450)/(0.25)\\ \\ F=1800\text{ N} \end{gathered}`

Therefore the correct option is the second one.