Answer:
Electromagnetism
Step-by-step explanation:
Electromagnetism is one of the four fundamental forces (the other three are gravity, strong nuclear force and weak nuclear force). It acts between all the particles having electric charge.
Electromagnetism is actually the unification of two forces:
- Electric force: this is the force that acts between charged particles which are at rest relative to each other. Its magnitude is given by

where k is the Coulomb's constant, q1 and q2 are the magnitude of the charges, and r the separation between them. It is attractive for same-sign charges and repulsive for opposite-sign charges.
- Magnetic force: this is the force that acts between charged particles which are moving relative to each other. Its magnitude is given by

where q is the charge, v the speed of the charge, and B the magnetic field produced by the other charge.