Answer: F = 5.76x10^-1 N
Step-by-step explanation:
The force between two charges is:
F = k*q1*q2/r^2
where k = 9x10^9 N*m^2/C^2 is the Coulomb's constant.
q1 and q2 = 6x10^-6 C
and r is the distance between the charges, here r = 0.75m
then the force is:
F = ( 9x10^9 N*m^2/C^2)*6x10^-6 C*6x10^-6 C/(0.75m)^2 = 576x10^-3 N
F = 5.76x10^-1 N
We have a positive force, this means that we have a repulsive force.