Answer:
Electrostatic force
Step-by-step explanation:
The force that acts between charged particles is called electrostatic force. Its magnitude is given by:

where
k is the Coulomb's constant
q1 and q2 are the magnitudes of the two charges
r is the distance between the two charges
Concerning the direction of the force:
- The force is attractive when the two charges have opposite signs, and
- The force is repulsive when the two charges have same sign