Answer: Change distance and charge
Explanation:
Increase the distance between the two particles, and remove charge from one or more of the particles.
Coulomb's Law is:
[tex]F=\frac{kq_1q_2}{r^2 }[/tex]
k being a constant of 8.99 x 10^9 (units)
q1 and q2 being the magnitude of charges
r being the distance between them