Question

A charge of `-2 C` is at `(-5 , 1 , 4 )` and a charge of `-3 C` is at `(0,8,4)`. If both coordinates are in meters, what is the force between the charges?

Answer 1

`F=0,729729*10^9N`

Explanation:

`P_a=(-5,1,4)`
`P_b=(0,8,4)`
`"r:distance between the point a an b"`
`r=sqrt((0-(-5))^2+(8-1)^2+(4-4)^2)`
`r=sqrt(25+49+0)`
`r=sqrt(74)`
`r^2=74m`
`"force between two point is given by Coulomb's law"`
`F=k* (q_1*q_2)/r^2`
`F=(9.10^9*(-2)*(-3))/74`
`F=(54.10^9)/74`
`F=0,729729*10^9N`