Final answer:
To increase the electric force between two charged particles, you can increase the charge of one particle or decrease the distance between the particles.
Step-by-step explanation:
The electric force between two charged particles can be increased by:
- Increasing the charge of one of the particles. When the charge of one particle is increased, the electric force between the two particles will increase.
- Decreasing the distance between the particles. When the distance between the particles is decreased, the electric force between them will increase.
Therefore, options C (Increase the charge of one of the particles) and D (Decrease the distance between the particles) would both increase the electric force between the two charged particles.