Question

A charge of `1 C` is at `(-7, 1 )` and a charge of `-3 C` is at `(3, 5 )`. If both coordinates are in meters, what is the force between the charges?

Answer 1

`2.33xx10^5`

Explanation:

first we have to measure the distance,

`r=sqrt((3+7)^2+(5-1)^2)`
`=sqrt(100+16)`
`=sqrt116`

we know,

`F=1/(4piepsilon)(q_1q_2)/r^2`

`=9xx10^9xx(1xx-3)/116`

`=2.33xx10^5`