Question

Question #109dc

Answer 1

`202.5"N"`

Explanation:

Coulomb's Law gives us the force `F` between two changes `q_2` and `q_2` separated by a distance `r`:

`F=1/(4piepsilon_0).(q_1xxq_2)/(r^2)`

This simplifies to:

`F=k.(q_1xxq_2)/(r^2)`

Where `k=9xx10^(9)"m/F"`

This distance between the two spheres is taken as the distance between their two centres. So `r=2xx0.2=0.4"m"`

`:.F=(9xx10^(9)xx(60xx10^(-6))^(2))/(0.4^2)`

`:.F=202.5"N"`